<PAGE>

                       Securities and Exchange Commission

                             Washington, D.C. 20549


                                    FORM 10-K

             [ X ] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934
                   For the fiscal year ended December 31, 1997
                                       OR
            [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

       For the transition period from ________________ to _______________


                       Commission File number 33-11773-14


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                    (Exact name of registrant as specified in
                     its Certificate of Limited Partnership)

         TEXAS                                         76-0318471
(State of Organization)                  (I.R.S. Employer Identification No.)


                         16825 Northchase Dr., Suite 400
                              Houston, Texas 77060
                                 (281) 874-2700
          (Address and telephone number of principal executive offices)


                 Securities registered pursuant to Section 12(b)
                                   of the Act:
                                      None

                 Securities registered pursuant to Section 12(g)
                                   of the Act:
                        56,952 Limited Partnership Units


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such shorter  periods that the  registrant  was
required),  and (2) has been subject to such filing requirements for the past 90
days.
                                    Yes X    No
                                       ---

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ X ]

Registrant does not have an aggregate  market value for its Limited  Partnership
Interests.

                       Documents Incorporated by Reference

Document                                            Incorporated as to

    Registration Statement No. 33-11773               Items 1 and 13
     on Form S-1


<PAGE>


                                TABLE OF CONTENTS

                             Form 10-K Annual Report
                     For the Period Ended December 31, 1997

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


<TABLE>
<CAPTION>
ITEM NO.                            PART I                                 PAGE
  <S>            <C>                                                      <C>
   1             Business                                                   I-1
   2             Properties                                                 I-5
   3             Legal Proceedings                                          I-7
   4             Submission of Matters to a Vote of
                   Security Holders                                         I-7


                                    PART II

   5             Market Price of and Distributions on the
                   Registrant's Units and Related Limited
                   Partner Matters                                         II-1
   6             Selected Financial Data                                   II-2
   7             Management's Discussion and Analysis of
                   Financial Condition and Results of Operations           II-2
   8             Financial Statements and Supplementary Data               II-3
   9             Disagreements on Accounting and Financial
                   Disclosure                                              II-3


                                    PART III

  10             Directors and Executive Officers of the
                   Registrant                                             III-1
  11             Executive Compensation                                   III-2
  12             Security Ownership of Certain Beneficial
                   Owners and Management                                  III-2
  13             Certain Relationships and Related Transactions           III-2


                                    PART IV

  14             Exhibits, Financial Statement Schedules
                   and Reports on Form 8-K                                 IV-1


                                    OTHER

                 Signatures
</TABLE>


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

                                     PART I


Item 1.  Business

General Description of Partnership

         Swift Energy Income Partners 1990-C,  Ltd., a Texas limited partnership
(the "Partnership" or the "Registrant"),  is a partnership formed under a public
serial limited partnership offering denominated Swift Energy Income Partners III
(Registration  Statement No. 33-11773 on Form S-1, originally declared effective
March 19, 1987,  and amended  effective  March 28, 1988,  May 4, 1989 and May 1,
1990 [the  "Registration  Statement"]).  The  Partnership  was formed  effective
September 30, 1990 under a Limited  Partnership  Agreement  dated  September 30,
1990. The initial 539 limited partners made capital contributions of $5,695,200.

         The  Partnership is  principally  engaged in the business of acquiring,
developing and, when  appropriate,  disposing of working interests in proven oil
and gas properties  within the continental  United States.  The Partnership does
not  engage  in  exploratory  drilling.   Each  working  interest  held  by  the
Partnership entitles the Partnership to receive, in kind or in value, a share of
the  production  of oil and gas from the producing  property,  and obligates the
Partnership  to  participate  in the  operation  of the property and to bear its
proportionate share of all operating costs associated therewith. The Partnership
typically  holds  less  than  the  entire  working  interest  in  its  producing
properties.

         At December  31,  1997,  the  Partnership  had expended or committed to
expend 100% of the limited  partners' net commitments  (i.e.,  limited partners'
commitments available to the Partnership for property acquisitions after payment
of  organization  fees and  expenses)  in the  acquisition  and  development  of
producing properties, which properties are described under Item 2, "Properties,"
below. The  Partnership's  revenues and profits are derived almost entirely from
the  sale of oil and gas  produced  from  its  properties  and  from the sale of
acquired  oil  and  gas  properties,   when  the  sale  of  such  properties  is
economically preferable to continued operation.

         The  Partnership's  business and affairs are  conducted by its Managing
General  Partner,  Swift Energy  Company,  a Texas  corporation  ("Swift").  The
Partnership's Special General Partner, VJM Corporation, a California corporation
("VJM"),  consults with and advises Swift as to certain financial matters. Swift
is the designated  operator of many of the  properties in which the  Partnership
owns  interests.  The remaining  properties  are operated by industry  operators
designated by the owners of a majority of the working interest in each property.

         The  general  manner  in  which  the  Partnership   acquires  producing
properties  and  otherwise  conducts  its business is described in detail in the
Registration Statement under "Proposed Activities," which is incorporated herein
by reference.  The following is intended only as a summary of the  Partnership's
manner of doing business and specific activities to date.

Liquidation

         In October  1997,  the managing  general  partner  informed the limited
partners of a proposal to sell all the Partnership's properties and dissolve and
liquidate the  Partnership.  The special meeting of Limited Partners was held on
November 25, 1997.

         Of the total units held by the limited  partners, a  majority voted for
adoption of the  proposal  for sales of  substantially  all of the assets of the
Partnership and the dissolution,  winding up and termination of the Partnership.
The  Partnership  adopted the  liquidation  basis of  accounting  for the period
subsequent to November 30, 1997.

Manner of Acquiring  Properties;  Net Profits and  Overriding  Royalty  Interest
Agreement

         For the sake of legal and  administrative  convenience,  the  producing
properties  owned by the Registrant  have  typically been acquired  initially by
Swift,  which then conveyed  ownership of each such property to the  Registrant.
The  Registrant  acquires  producing  properties  from  Swift  at  the  property
acquisition  cost of such  properties  to Swift,  as  adjusted  for  intervening
operations.

                                      I-1

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

         The  Registrant  entered  into a Net  Profits  and  Overriding  Royalty
Interest  Agreement dated September 30, 1990 (the "NP/OR  Agreement") with Swift
Energy  Managed   Pension  Assets   Partnership   1990-C,   Ltd.  (the  "Pension
Partnership").  The Pension  Partnership is a Texas limited  partnership that is
also  managed by Swift and VJM.  The Pension  Partnership  was formed to acquire
nonoperating  interests,  such as net profits,  royalty and  overriding  royalty
interests, in producing oil and gas properties.

         Under the NP/OR Agreement,  the Registrant and the Pension  Partnership
have, in effect,  combined their funds in acquiring producing properties;  using
funds  committed to the NP/OR  Agreement by both  partnerships,  the  Registrant
acquires  producing  properties,  then promptly conveys  nonoperating  interests
therein  to  the  Pension   Partnership.   The  Registrant  initially  committed
$5,200,650  and the  Pension  Partnership  initially  committed  $3,072,822  for
acquisitions  under the NP/OR  Agreement.  The Registrant is obligated under the
NP/OR  Agreement  to convey to the Pension  Partnership  a 37% fixed net profits
interest and a variable overriding royalty interest in specified depths of every
producing  property it  acquires,  except  that (i)  properties  anticipated  to
require  significant  development  operations,  and (ii) nonoperating  interests
offered to the  Registrant by third  parties may be purchased by the  registrant
outside the NP/OR Agreement,  without  participation by the Pension Partnership.
The  Registrant is entitled to withdraw up to 30% of its  committed  funds under
the NP/OR Agreement for such acquisitions.

         All properties  acquired by the Registrant  since the date of the NP/OR
Agreement have been acquired subject to the NP/OR Agreement and the nonoperating
interests created thereby. At December 31, 1997, the Registrant had not made any
withdrawals   to  acquire   properties   anticipated   to  require   significant
development.

         In accordance with its  obligations  under the NP/OR  Agreement,  as of
December 31, 1997 the Registrant  had conveyed to the Pension  Partnership a net
profits interest burdening certain depths of all producing  properties  acquired
by the  Registrant  since  the date of the  NP/OR  Agreement.  Typically,  a net
profits  interest in an oil and gas  property  entitles the owner to a specified
percentage share of the gross proceeds generated by the burdened  property,  net
of  operating  costs.  The 37% net  profits  interest  conveyed  to the  Pension
Partnership  under the NP/OR  Agreement  differs  from the  typical  net profits
interest in that it is calculated over the entire group of producing  properties
acquired under the NP/OR  Agreement;  i.e., all operating costs  attributable to
the burdened  depths of such  properties are  aggregated,  and the total is then
subtracted  from the total of all gross proceeds  attributable to such depths in
order to calculate the net profits to which the Pension Partnership is entitled.
The net profits interest conveyed to the Pension  Partnership burdens only those
depths of each subject  property which were evaluated to contain proved reserves
at the date of acquisition, to the extent such depths underlie specified surface
acreage.

         The Registrant has also conveyed to the Pension  Partnership  under the
NP/OR Agreement an overriding  royalty interest in each property  acquired since
the date of the NP/OR Agreement.  An overriding royalty interest is a fractional
interest in the gross  production (or the gross  proceeds  therefrom) of oil and
gas  from  a  property,  free  of any  exploration,  development,  operation  or
maintenance expenses. Under the NP/OR Agreement, the overriding royalty interest
burdens the portions of each producing  property that were evaluated at the date
of acquisition not to contain proved reserves.

Competition, Markets and Regulations

         Competition

         The oil and gas industry is highly  competitive in all its phases.  The
Partnership encounters strong competition from many other oil and gas producers,
many of which possess substantial financial resources, in acquiring economically
desirable Producing Properties.

         Markets

         The amounts of and price  obtainable  for oil and gas  production  from
Partnership  Properties will be affected by market factors beyond the control of
the  Partnership.  Such factors include the extent of domestic  production,  the
level of imports of foreign oil and gas, the general level of market demand on a
regional, national and worldwide basis, domestic and foreign economic conditions
that  determine  levels of industrial  production,  political  events in foreign
oil-producing  regions, and variations in governmental  regulations and tax laws
and  the  imposition  of new  governmental  requirements  upon  the  oil and gas
industry. There can be no assurance that oil and gas prices will not decrease in
the future, thereby decreasing net Revenues from Partnership Properties.

                                      I-2

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


         From time to time,  there may exist a  surplus  of  natural  gas or oil
supplies,  the effect of which may be to reduce the amount of hydrocarbons  that
the  Partnerships may produce and sell while such oversupply  exists.  In recent
years,  initial steps have been taken to provide  additional gas  transportation
lines from Canada to the United States. If additional Canadian gas is brought to
the United States market, it could create downward pressure on United States gas
prices.

         Regulations

         Environmental Regulation

         The federal  government  and various state and local  governments  have
adopted  laws and  regulations  regarding  the control of  contamination  of the
environment.  These laws and regulations may require the acquisition of a permit
by Operators before drilling commences,  prohibit drilling activities on certain
lands  lying  within  wilderness  areas or where  pollution  arises  and  impose
substantial  liabilities for pollution  resulting from operations,  particularly
operations near or in onshore and offshore waters or on submerged  lands.  These
laws and  regulations  may also  increase  the  costs of  routine  drilling  and
operation of wells.  Because these laws and regulations change  frequently,  the
costs to the  Partnership of compliance  with existing and future  environmental
regulations cannot be predicted.  However, the Managing Partner does not believe
that the  Partnership is affected in a significantly  different  manner by these
regulations than are its competitors in the oil and gas industry.

         Federal Regulation of Natural Gas

         The  transportation  and sale of natural gas in interstate  commerce is
heavily  regulated  by  agencies  of  the  federal  government.   The  following
discussion is intended only as a summary of the principal statutes,  regulations
and  orders  that  may  affect  the  production  and  sale of  natural  gas from
Partnership  Properties.  This  summary  should not be relied upon as a complete
review of applicable natural gas regulatory provisions.

         FERC Orders

         Several major  regulatory  changes have been implemented by the Federal
Energy Regulatory  Commission  ("FERC") from 1985 to the present that affect the
economics of natural gas production,  transportation and sales. In addition, the
FERC  continues  to  promulgate  revisions  to various  aspects of the rules and
regulations  affecting  those  segments of the natural gas industry  that remain
subject to the FERC's jurisdiction. In April 1992, the FERC issued Order No. 636
pertaining to pipeline restructuring. This rule requires interstate pipelines to
unbundle  transportation  and sales services by separately  stating the price of
each service and by providing  customers  only the particular  service  desired,
without  regard to the source for  purchase of the gas.  The rule also  requires
pipelines to (i) provide  nondiscriminatory  "no-notice"  service  allowing firm
commitment  shippers to receive  delivery of gas on demand up to certain  limits
without  penalties,  (ii) establish a basis for release and reallocation of firm
upstream  pipeline  capacity  and  (iii)  provide  non-discriminatory  access to
capacity by firm  transportation  shippers on a  downstream  pipeline.  The rule
requires interstate  pipelines to use a straight fixed variable rate design. The
rule imposes these same requirements upon storage facilities.

         FERC Order No. 500  affects the  transportation  and  marketability  of
natural gas.  Traditionally,  natural gas has been sold by producers to pipeline
companies,  which then  resold the gas to  end-users.  FERC Order No. 500 alters
this market structure by requiring  interstate  pipelines that transport gas for
others to provide  transportation  service to  producers,  distributors  and all
other shippers of natural gas on a nondiscriminatory, "first-come, first-served"
basis ("open access  transportation"),  so that producers and other shippers can
sell natural gas directly to end-users.  FERC Order No. 500 contains  additional
provisions intended to promote greater competition in natural gas markets.

         It is not anticipated  that the  marketability  of and price obtainable
for natural gas production from  Partnership  Properties  will be  significantly
affected  by FERC  Order No.  500.  Gas  produced  from  Partnership  Properties
normally  will be sold to  intermediaries  who have entered into  transportation
arrangements with pipeline companies.  These  intermediaries will accumulate gas
purchased from a number of producers and sell the gas to end-users  through open
access pipeline transportation.

                                      I-3

<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


         State Regulations

         Production  of any oil  and gas  from  Partnership  Properties  will be
affected  to some  degree  by  state  regulations.  Many  states  in  which  the
Partnership will operate have statutory provisions regulating the production and
sale  of oil  and  gas,  including  provisions  regarding  deliverability.  Such
statutes, and the regulations promulgated in connection therewith, are generally
intended to prevent  waste of oil and gas and to protect  correlative  rights to
produce  oil and  gas  between  owners  of a  common  reservoir.  Certain  state
regulatory  authorities  also  regulate  the amount of oil and gas  produced  by
assigning allowable rates of production to each well or proration unit.

         Federal Leases

         Some of the Partnership's properties are located on federal oil and gas
leases  administered by various federal  agencies,  including the Bureau of Land
Management.   Various  regulations  and  orders  affect  the  terms  of  leases,
exploration and development plans, methods of operation and related matters.

         Employees

         The  Partnership  has no  employees.  Swift,  however,  has a staff  of
geologists,   geophysicists,   petroleum  engineers,   landmen,  and  accounting
personnel who  administer  the  operations of Swift and the  Partnership.  As of
December 31, 1997, Swift had 194 employees.  Swift's administrative and overhead
expenses  attributable  to  the  Partnership's   operations  are  borne  by  the
Partnership.


                                      I-4


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

Item 2.  Properties

         As of December  31, 1997,  the  Partnership  has acquired  interests in
producing oil and gas properties which are generally described below.

Principal Oil and Gas Producing Properties

         The most  valuable  fields  in the  Partnership,  based  upon  year-end
engineering  estimates of discounted  future net revenues using constant pricing
and costs, are described below.

         1. The  Velrex  Field is  located  in  Schleicher  County,  Texas,  and
accounts for 43% of the value in this  Partnership.  Wells in this field produce
from the Henderson and Canyon Sands, (Sugarland acquisition).

         2. The  Cody  Bell  Field is in  Schleicher  County,  Texas  (Sugarland
acquisition). This field represents 25% of the Partnership's value.

         3. The Key Field is in Wheeler County, Texas (Arkla acquisition).  This
field represents 20% of the Partnership's value.

         The remaining  value in the  Partnership  is  attributable  to numerous
properties  none of which equals or exceeds 15 percent of the total  Partnership
value.

Title to Properties

         Title to  substantially  all  significant  producing  properties of the
Partnership has been examined. The properties are subject to royalty, overriding
royalty and other  interests  customary in the  industry.  The Managing  General
Partner does not believe any of these burdens  materially detract from the value
of the properties or will materially detract from the value of the properties or
materially  interfere  with their use in the  operation  of the  business of the
Partnership.

Production and Sales Price

         The following table  summarizes the sales volumes of the  Partnership's
net oil and gas production  expressed in MCFs.  Equivalent  MCFs are obtained by
converting oil to gas on the basis of their relative energy content;  one barrel
equals 6,000 cubic feet of gas.

<TABLE>
<CAPTION>
                                                  Net Production
                                         -------------------------------
                                               For the Years Ended
                                                   December 31,
                                         -------------------------------
                                           1997       1996         1995
                                         -------     -------     -------
<S>                                      <C>         <C>         <C>
Net Volumes (Equivalent MCFs)            177,596     305,494     357,960

Average Sales Price
   per Equivalent MCF                    $2.41       $2.17       $1.67

Average Production Cost
   per Equivalent MCF
   (includes production taxes)           $0.92       $0.79       $0.82
</TABLE>

                                      I-5


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


Net Proved Oil and Gas Reserves

         Presented below are the estimates of the Partnership's  proved reserves
as of December 31, 1997, 1996 and 1995. All of the Partnership's proved reserves
are located in the United States.

<TABLE>
<CAPTION>
                                                                      December 31,
                                    ----------------------------------------------------------------------
                                           1997                     1996                        1995
                                    ------------------       -------------------       -------------------
                                               Natural                  Natural                    Natural
                                      Oil       Gas            Oil        Gas            Oil         Gas
                                   -------    --------       -------    --------       -------    --------
                                    (BBLS)     (MMCF)         (BBLS)     (MMCF)         (BBLS)      MMCF)
<S>                                <C>           <C>         <C>         <C>           <C>           <C>
Proved developed
   reserves at end of year           5,714         692        14,509      1,165         62,254       2,591
                                   -------      ------       -------      -----        -------       -----
Proved reserves
   Balance at beginning
     of year                        17,489       1,424        66,494      2,787         68,649       3,172

   Extensions, discoveries
     and other additions                --          --            --         --             --          --

   Revisions of previous
     estimates                       2,860         (27)        2,911        136         10,239        (102)

   Sales of minerals in
     place                         (10,499)       (374)      (44,633)    (1,237)            --          --

   Production                       (2,775)       (161)       (7,283)      (262)       (12,394)       (283)
                                   -------      ------       -------     ------        -------       -----

   Balance at end of year            7,075         862        17,489      1,424         66,494       2,787
                                   -------       -----       -------     ------        -------       -----
</TABLE>


         Revisions  of  previous  quantity  estimates  are  related to upward or
downward  variations  based on current  engineering  information  for production
rates,  volumetrics and reservoir  pressure.  Additionally,  changes in quantity
estimates  are the result of the  increase  or decrease in crude oil and natural
gas prices at each year end which have the effect of adding or  reducing  proved
reserves on marginal properties due to economic limitations.

                                      I-6


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


         The following table summarizes by acquisition the Registrant's reserves
and gross and net  interests in  producing  oil and gas wells as of December 31,
1997:

<TABLE>
<CAPTION>
                                                             Reserves
                                                        December 31, 1997
                                                      ---------------------

                                                            Natural             Wells
                                                 Oil           Gas        -----------------
Acquisition             State(s)               (BBLS)        (MMCF)       Gross       Net
-----------             ---------              ------        ------       -----     -------
<S>                     <C>                     <C>            <C>          <C>       <C>
Richer                  TX                         10           50           4        0.077
Sugarland               OK, TX                  6,952          637          56        4.959
Arkla                   TX                        113          175           2        0.335
                                               ------        -----          --        -----
                                                7,075          862          62        5.371
                                               ------        -----          --        -----
</TABLE>

         There are numerous  uncertainties  inherent in estimating quantities of
proved  reserves and in projecting  the future rates of  production,  timing and
plan of  development.  Oil and gas reserve  engineering  must be recognized as a
subjective process of estimating  underground  accumulations of oil and gas that
cannot be measured  in an exact way,  and  estimates  of other  engineers  might
differ  from  those  above,  audited  by H. J.  Gruy and  Associates,  Inc.,  an
independent petroleum consulting firm. The accuracy of any reserve estimate is a
function of the quality of  available  data and of  engineering  and  geological
interpretation  and  judgment.  Results  of  drilling,  testing  and  production
subsequent  to the date of the estimate may justify  revision of such  estimate,
and, as a general rule,  reserve  estimates based upon  volumetric  analysis are
inherently  less  reliable  than  those  based on  lengthy  production  history.
Accordingly,  reserve  estimates are often  different from the quantities of oil
and gas that are ultimately recovered.

         In estimating  the oil and natural gas  reserves,  the  Registrant,  in
accordance with criteria  prescribed by the Securities and Exchange  Commission,
has used prices received as of December 31, 1997 without  escalation,  except in
those instances where fixed and determinable  gas price  escalations are covered
by  contracts,  limited  to the  price the  Partnership  reasonably  expects  to
receive.  The  Registrant  does not believe that any  favorable or adverse event
causing a significant  change in the estimated  quantity of proved  reserves has
occurred between December 31, 1997 and the date of this report.

         Future prices received for the sale of the  Partnership's  products may
be higher or lower than the prices used in the evaluation  described  above; the
operating  costs relating to such  production may also increase or decrease from
existing  levels.  The estimates  presented  above are in accordance  with rules
adopted by the Securities and Exchange Commission.

Item 3. Legal Proceedings

         The Partnership is not aware of any material pending legal  proceedings
to which it is a party or of which any of its property is the subject.

Item 4. Submission of Matters to a Vote of Security Holders

         No matters  were  submitted  to a vote of limited  partners  during the
fourth  quarter of the fiscal year covered by this  report,  except as discussed
above in Item 1. "Liquidation" section.

                                      I-7

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

                                     PART II


Item 5. Market Price of and  Distributions  on the  Registrant's  Units and
Related Limited Partner Matters

Market Information

         Units in the  Partnership  were  initially  sold at a price of $100 per
Unit.  Units are not traded on any exchange and there is no  established  public
trading  market for the Units.  Swift is aware of negotiated  transfers of Units
between  unrelated  parties;  however,  these  transfers  have been  limited and
sporadic.  Due to the  nature of these  transactions,  Swift  has no  verifiable
information regarding prices at which Units have been transferred.

Holders

         As of December 31, 1997,  there were 539 Limited Partners holding Units
in the Partnership.

Distributions

         The Partnership  generally makes distributions to Limited Partners on a
quarterly  basis,   subject  to  the  restrictions  set  forth  in  the  Limited
Partnership Agreement. In the fiscal years ended December 31, 1996 and 1997, the
Partnership  distributed  a total of $140,000 and $85,500,  respectively  to the
holders of its Units.  Cash  distributions  constitute net proceeds from sale of
oil and gas  production  after  payment of lease  operating  expenses  and other
partnership expenses.  Some or all of such amounts or any proceeds from the sale
of partnership  properties  could be deemed to constitute a return of investors'
capital.

         Due to the liquidation of the Partnership,  the last regular  quarterly
distribution  was made in January 1998. For  information  regarding  liquidating
distributions,  reference is made to Item 7.  "Liquidity and Capital  Resources"
section.

                                      II-1


<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

Item 6. Selected Financial Data

         The following  selected  financial  data,  prepared in accordance  with
generally  accepted  accounting  principles as of December 31, 1997, 1996, 1995,
1994 and  1993,  should be read in  conjunction  with the  financial  statements
included in Item 8:

<TABLE>
<CAPTION>
                                  1997               1996               1995              1994             1993
                              ------------       ------------       ------------      ------------     ------------
<S>                        <C>                <C>                <C>               <C>                <C>
Revenues                   $     430,784      $     672,124      $      617,897    $     916,168      $  1,085,999
Income (Loss)              $      69,901      $      65,688      $     (460,741)   $  (1,140,169)     $     74,637
Total Assets               $                  $   1,205,615      $    1,945,806    $   2,541,069      $  4,100,321
Cash Distributions         $     115,223      $     174,103      $       96,281    $     215,823      $    678,656
Long Term Obligations      $                  $          --      $           --    $      33,664      $    168,323
Limited Partners' Net
 Income (Loss) Per Unit    $        1.14      $        1.10      $        (7.33)   $      (17.65)     $        .91
Limited Partners' Cash
 Distributions Per Unit    $        1.50      $        2.46      $         1.28    $        3.15      $      11.04

</TABLE>

Item 7. Management's Discussion and Analysis of Financial Condition and
         Results of Operations

Liquidation

         In October  1997,  the managing  general  partner  informed the limited
partners of a proposal to sell all the Partnership's properties and dissolve and
liquidate the  Partnership.  The special meeting of Limited Partners was held on
November 25, 1997.

         Of the total units held by the limited  partners, a  majority voted for
adoption of the  proposal  for sales of  substantially  all of the assets of the
Partnership and the dissolution,  winding up and termination of the Partnership.
The  Partnership  adopted the  liquidation  basis of  accounting  for the period
subsequent to November 30, 1997.

Liquidity and Capital Resources

         Oil  and  gas  reserves  are  depleting   assets  and  therefore  often
experience   significant   production  declines  each  year  from  the  date  of
acquisition  through the end of the life of the property.  The primary source of
liquidity to the  Partnership  comes almost  entirely from the income  generated
from the sale of oil and gas produced  from  ownership  interests in oil and gas
properties and during liquidation from the sale of the ownership of interests in
oil and gas  properties.  Net cash  provided by (used in)  operating  activities
totaled   $(120,927),   $(195,708)   and  $282,048  in  1997,   1996  and  1995,
respectively.  Cash  provided  by  property  sales  proceeds  totaled  $386,694,
$496,160 and $863 in 1997,  1996 and 1995,  respectively.  The  Partnership  has
expended  all  of  the   partner's  net   commitments   available  for  property
acquisitions and development by acquiring producing oil and gas properties.  The
partnership invests primarily in proved producing properties with nominal levels
of future costs of development for proven but undeveloped reserves.  Significant
purchases  of  additional  reserves  or  extensive  drilling  activity  are  not
anticipated. Capital expenditures in 1997, 1996 and 1995 totaled $0, $93,600 and
$51,581, respectively. Cash distributions to partners totaled $115,223, $174,103
and $96,281 in 1997, 1996 and 1995, respectively.

         After sale of all its properties and settlement of its liabilities, the
Partnership's  assets will consist solely of cash,  which it will  distribute to
its partners in complete  liquidation.  The Partnership will not realize gain or
loss upon such  distribution of cash to its partners in liquidation.  No capital
expenditures have been made in the eleven month period ending November 30, 1997,
and none are anticipated through the date of final liquidation.

Results of Operations

         As a result of the limited partners' approval of the liquidation of the
Partnership,  the  Partnership  has changed its basis of  accounting,  effective
December  1, 1997,  from the  historical  cost basis to the  liquidation  basis.
During the process of liquidating the Partnership, the Partnership continued its
operations  which primarily  consisted of the production and sale of oil and gas
from  producing  properties.  Under the  liquidation  basis of  accounting,  the
Partnership's  financial  results  from these  operations  are  included  in the
Statement  of Changes in Net Assets  for the  period  from  December  1, 1997 to
December 31, 1997.  The  Partnership's  results from its oil and gas  operations
presented  herein  are on a  combined  basis for the 1997  periods  prior to and
subsequent to the adoption of the liquidation basis of accounting.

                                      11-2

<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


         Oil and gas sales  decreased  36 percent in 1997 vs.  1996.  Production
volumes  decreased 42 percent due to a 39 percent gas production  decrease and a
69 percent oil production decline. The decrease in production,  primarily due to
the sale of oil and gas assets as a part of the liquidation process, had a major
impact on  partnership  performance.  An  increase  in the 1997 gas prices of 16
percent or $.32/MCF partially offset the production declines.  The average sales
price per equivalent MCF increased 11 percent in 1997 as gas prices increased 16
percent and oil prices increased 1 percent.

         Production  cost  per  equivalent  MCF  increased  16  percent  in 1997
compared to 1996,  primarily due to the decline in production volumes;  however,
total production costs decreased 33 percent in 1997.

         Oil and gas sales  increased 9 percent in 1996 vs.  1995.  Increases in
both 1996 gas and oil prices were major contributors to the increased  revenues.
The Partnership  experienced an increase in gas prices of 40 percent or $.58/MCF
and an increase  in oil prices of 21 percent or  $3.26/BBL.  The  average  sales
price per  equivalent  MCF  increased  30  percent in 1996.  Production  volumes
decreased  15  percent  due to a 41 percent  oil  production  decrease  and an 8
percent gas  production  decline.  The  partnership's  sale of several low value
properties had an impact on  partnership  performance.  The production  declines
partially   offset  the  effect  of  increased  oil  and  gas  prices  impacting
partnership performance.

         Production cost per equivalent MCF decreased 4 percent in 1996 compared
to 1995 and total production costs decreased 17 percent in 1996.

         The  Partnership  recorded an  additional  provision  in  depreciation,
depletion  and  amortization  in  1995  of  $417,905  when  the  present  value,
discounted  at ten percent,  of estimated  future net revenues  from oil and gas
properties,  using the guidelines of the Securities and Exchange Commission, was
below the fair market value paid for oil and gas properties  resulting in a full
cost ceiling impairment.

         From  January 1, 1998  until the date the  Partnership  is  liquidated,
Partnership  revenues and costs will be shared between the limited  partners and
general  partners  in a  90:10  ratio,  based  on the  annualized  rate  of cash
distributions  by the Partnership  during a certain period prior to December 31,
1997.

Item 8. Financial Statements and Supplementary Data

         See Part IV, Item 14(a) for index to financial statements.

Item 9. Disagreements on Accounting and Financial Disclosure

         None.


                                      II-3


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

                                    PART III


Item 10.  Directors and Executive Officers of the Registrant

         As a limited partnership,  the Registrant has no directors or executive
officers.  The  business and affairs of the  Registrant  are managed by Swift as
Managing General Partner.  Set forth below is certain information as of February
18, 1998 regarding the directors and executive officers of Swift.

<TABLE>
<CAPTION>
                                           Position(s) with
         Name              Age         Swift and Other Companies
         ----              ---         -------------------------
<S>                        <C>      <C>
                                    DIRECTORS

A. Earl Swift              64       Chief Executive Officer and
                                    Chairman of the Board

Virgil N. Swift            69       Executive Vice President - Business
                                    Development, Vice Chairman of the Board

G. Robert Evans            66       Director of Swift; Chairman of the Board,
                                    Material Sciences Corporation;
                                    Director, Consolidated Freightways, Inc.,
                                    Fibreboard  Corporation,   Elco  Industries,
                                    and Old Second Bancorp

Raymond O. Loen            73       Director of Swift; President, R. O. Loen
                                    Company

Henry C. Montgomery        62       Director of Swift; Chairman of the Board,
                                    Montgomery Financial Services Corporation;
                                    Director, Southwall Technology Corporation

Clyde W. Smith, Jr.        49       Director of Swift; President, Somerset
                                    Properties, Inc.

Harold J. Withrow          70       Director of Swift

                                    EXECUTIVE OFFICERS

Terry E. Swift             42       President, Chief Operating Officer

John R. Alden              52       Senior Vice President - Finance,
                                    Chief Financial Officer and Secretary

Bruce H. Vincent           50       Senior Vice President - Funds Management

James M. Kitterman         53       Senior Vice President - Operations

Joe A. D'Amico             49       Senior Vice President- Exploration and
                                    Development

Alton D. Heckaman, Jr.     40       Vice President - Finance and
                                    Controller
</TABLE>


                                     III-1


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


         From time to time, Swift as Managing General Partner of the Partnership
purchases Units in the  Partnership  from investors who offer the Units pursuant
to their right of  presentment,  which  purchases are made pursuant to terms set
out in the  Partnership's  original Limited  Partnership  Agreement.  Due to the
frequency  and  large  number  of  these   transactions,   Swift  reports  these
transactions  under  Section  16 of the  Securities  Exchange  Act of 1934 on an
annual  rather than a monthly  basis.  In some cases such annual  reporting  may
constitute a late filing of the required Section 16 reports under the applicable
Section 16 rules.

Item 11.  Executive Compensation

         As  noted  in  Item  10,  "Directors  and  Executive  Officers  of  the
Registrant,"  above,  the Partnership has no executive  officers.  The executive
officers of Swift and VJM are not compensated by the Partnership.

         Certain fees and  allowances  contemplated  by the Limited  Partnership
Agreement  have been paid by the  Partnership  to Swift and VJM. See Note (4) in
Notes  To  Financial   Statements   (Related-Party   Transactions)  for  further
discussion.

Item 12.  Security Ownership of Certain Beneficial Owners and Management

         Swift Energy Company,  the Managing General  Partner,  located at 16825
Northchase  Drive,   Suite  400,  Houston,   Texas  77060,  owns  3,565  Limited
Partnership Units, which is 6.26 percent of all outstanding  Limited Partnership
Units. All Limited Partnership Units owned by Swift were acquired from investors
who  offered  the  Limited   Partnership   Units  pursuant  to  their  right  of
presentment.  As the Managing General Partner, Swift is not permitted generally,
under the Limited Partnership Agreement,  to vote its Limited Partnership Units.
Swift also owns a general  partnership  interest of 9 percent of all partnership
interests in the Partnership.

         Swift and VJM are not aware of any arrangement,  the operation of which
may at a subsequent date result in a change in control of the Partnership.

Item 13.  Certain Relationships and Related Transactions

         As  noted  in  Item  10,  "Directors  and  Executive  Officers  of  the
Registrant," above, the Partnership has no executive officers or directors,  and
thus has not  engaged  in any  transactions  in which  any  such  person  had an
interest.  The Partnership is permitted to engage in certain  transactions  with
Swift as Managing General Partner and VJM as Special General Partner, subject to
extensive  guidelines  and  restrictions  as  described  in  the  "Conflicts  of
Interest"  section  of the  Amended  Prospectus  contained  in the  Registration
Statement, which is incorporated herein by reference.

         Summarized  below are the  principal  transactions  that have  occurred
between the Partnership and Swift, VJM and their affiliates.

         1. The oil and gas properties acquired by the Partnership, as described
in Item 2, "Properties"  above, were typically  acquired initially by Swift from
the  seller  thereof  and  subsequently  transferred  to the  Partnership.  Such
transfers  were made by Swift at its Property  Acquisition  Costs (as defined in
the  Limited  Partnership  Agreement),  less any amounts  received  from sale of
production  between the time of acquisition by Swift and the time of sale to the
Partnership.

         2.  Swift  acts  as  operator  for  many  of the  wells  in  which  the
Partnership  has  acquired  interests  and has  received  compensation  for such
activities in accordance with standard industry operating agreements.

         3. The  Partnership  paid to Swift and VJM certain fees as contemplated
by the  Limited  Partnership  Agreement.  See Note  (4) in  Notes  To  Financial
Statements (Related-Party Transactions) for further discussion.


                                     III-2


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.

                                     PART IV


<TABLE>
<CAPTION>
Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K

      a(1)     FINANCIAL STATEMENTS                                   PAGE NO.
                                                                      --------
               <S>                                                      <C>
               Report of Independent Public Accountants                 IV-3

               Statement of Net Assets in Process of Liquidation
                  as of December 31, 1997                               IV-4

               Balance Sheet as of December 31, 1996                    IV-5

               Statement of Changes in Net Assets in Process of
                  Liquidation for the period from December 1, 1997
                  to December 31, 1997                                  IV-6

               Statements of Operations for the period from
                  January 1, 1997 to November 30, 1997 and for
                  the years ended December 31, 1996 and 1995            IV-7

               Statements of Partners' Capital for the period from
                  January 1, 1997 to November 30, 1997 and for the
                  years ended December 31, 1996 and 1995                IV-8

               Statements of Cash Flows for the period from
                  January 1, 1997 to November 30, 1997 and for
                  the years ended December 31, 1996 and 1995            IV-9

               Notes to Financial Statements                            IV-10
</TABLE>
       a(2)    FINANCIAL STATEMENT SCHEDULES

               All schedules required by the SEC are either  inapplicable or the
               required information is included in the Financial Statements, the
               Notes thereto, or in other information included elsewhere in this
               report.

       a(3)    EXHIBITS

               3.1    Limited  Partnership  Agreement  of  Swift  Energy  Income
                      Partners  1990-C,  Ltd.,  dated September 30, 1990.  (Form
                      10-K for year ended December 31, 1990, Exhibit 3.1).

               3.2    Certificate of Limited  Partnership of Swift Energy Income
                      Partners  1990-C,  Ltd., as filed September 27, 1990, with
                      the Texas  Secretary  of State.  (Form 10-K for year ended
                      December 31, 1990, Exhibit 3.2).

               10.1   Net  Profits and  Overriding  Royalty  Interest  Agreement
                      between  Swift Energy  Income  Partners  1990-C,  Ltd. and
                      Swift Energy Managed  Pension Assets  Partnership  1990-C,
                      Ltd. dated  September 30, 1990.  (Form 10-K for year ended
                      December 31, 1990, Exhibit 10.1).

               99.1   A copy of the following section of the Amended  Prospectus
                      dated  March  28,  1988,   contained   in   Post-Effective
                      Amendment No. 1 to Registration  Statement No. 33-11773 on
                      Form S-1 for Swift Energy Income Partners III, as filed on
                      March 25,  1988,  which have been  incorporated  herein by
                      reference:   "Proposed   Activities"  (pp  36  -  50)  and
                      "Conflicts of Interest" (pp. 70 - 78). (Form 10-K for year
                      ended December 31, 1990, Exhibit 28.1).


                                      IV-1


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.


       b(1)    REPORTS ON FORM 8-K

               No reports on Form 8-K have been filed  during the quarter  ended
December 31, 1997.

Supplemental  Information to be Furnished with Reports Filed Pursuant to Section
15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to
Section 12 of the Act.

         No annual report to security  holders covering the  Partnership's  1997
fiscal  year,  or proxy  statement,  form of proxy  or  other  proxy  soliciting
material has been sent to Limited Partners of the Partnership.


                                      IV-2


<PAGE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS




To Swift Energy Income Partners 1990-C, Ltd.:

         We have audited the  accompanying  balance sheet of Swift Energy Income
Partners  1990-C,  Ltd., (a Texas limited  partnership) as of December 31, 1996,
the related  statements of operations,  partners' capital and cash flows for the
period  from  January  1,  1997 to  November  30,  1997  and the  statements  of
operations,  partners'  capital and cash flows for the years ended  December 31,
1996 and 1995.  In  addition,  we have  audited the  statement  of net assets in
process of  liquidation  as of December 31, 1997,  and the related  statement of
changes in net assets in process of liquidation  for the period from December 1,
1997 to December 31, 1997. These financial  statements are the responsibility of
the Managing General Partner's  management.  Our responsibility is to express an
opinion on these financial statements based on our audits.

         We conducted our audits in accordance with generally  accepted auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

         As  described  in  Note  1 to the  financial  statements,  the  limited
partners  of Swift  Energy  Income  Partners  1990-C,  Ltd.  approved  a plan of
liquidation  on November  25,  1997 and the  Partnership  commenced  liquidation
shortly  thereafter.  As a result,  the  Partnership  has  changed  its basis of
accounting for periods subsequent to November 30, 1997, from the historical cost
basis to the liquidation basis. Accordingly, the carrying value of the remaining
assets as of December 31, 1997, are presented at estimated realizable values and
all liabilities are presented at estimated settlement amounts.

         In our opinion,  the  financial  statements  referred to above  present
fairly, in all material respects,  the financial position of Swift Energy Income
Partners  1990-C,  Ltd.,  as of  December  31,  1996,  and  the  results  of its
operations  and its cash flows for the period  from  January 1, 1997 to November
30, 1997 and for the years ended  December 31, 1996 and 1995,  its net assets in
process of  liquidation  as of  December  31,  1997,  and the changes in its net
assets in  process  of  liquidation  for the  period  from  December  1, 1997 to
December 31, 1997, in conformity with generally accepted  accounting  principles
applied on the bases described in the preceding paragraph.

         As discussed in Note 1 to the financial statements, it is not presently
determinable  whether  the  amounts  realizable  from  the  disposition  of  the
remaining  assets or the amounts that creditors agree to accept in settlement of
the  obligations  due them will differ  materially from the amounts shown in the
accompanying financial statements.  The accompanying financial statements do not
include any adjustments that might result from the outcome of this uncertainty.




                                          ARTHUR ANDERSEN LLP




Houston, Texas
February 10, 1998


                                      IV-3


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
      STATEMENT OF NET ASSETS IN PROCESS OF LIQUIDATION - DECEMBER 31, 1997


<TABLE>
<CAPTION>
                                                                                            1997
                                                                                       --------------
         <S>                                                                           <C>
         ASSETS:

              Cash and cash equivalents                                                $      261,975
              Oil and gas sales receivable                                                    215,615
              Gas Imbalance Receivable                                                         15,212
              Oil and Gas Properties                                                          988,375
                                                                                       ---------------
                  Total Assets                                                              1,481,177
                                                                                       ---------------


         LIABILITIES:

              Accounts Payable                                                                 43,177
              Gas Imbalance Payable                                                            20,084
                                                                                       ---------------
                  Total Liabilities                                                            63,261
                                                                                       ---------------
              Net Assets in Process of Liquidation                                     $    1,417,916
                                                                                       ===============
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-4


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                                  BALANCE SHEET
                                DECEMBER 31, 1996


<TABLE>
<CAPTION>
                                                                                            1996
                                                                                      ---------------
         <S>                                                                           <C>
         ASSETS:

         Current Assets:
              Cash and cash equivalents                                                $        1,129
              Oil and gas sales receivable                                                    137,626
                                                                                      ----------------
                  Total Current Assets                                                        138,755
                                                                                      ----------------

         Gas Imbalance Receivable                                                              18,347
                                                                                       ---------------

         Oil and Gas Properties, using full cost
              accounting                                                                    5,849,487
         Less-Accumulated depreciation, depletion
              and amortization                                                             (4,800,974)
                                                                                      ----------------
                                                                                            1,048,513
                                                                                      ----------------
                                                                                       $    1,205,615
                                                                                      ================


         LIABILITIES AND PARTNERS' CAPITAL:

         Current Liabilities:
              Accounts Payable                                                         $      282,699
                                                                                      ----------------

         Deferred Revenues                                                                     23,268

         Limited Partners' Capital (56,952 Limited Partnership Units;
                                    $100 per unit)                                            837,020
         General Partners' Capital                                                             62,628
                                                                                      ----------------
                  Total Partners' Capital                                                     899,648
                                                                                      ----------------
                                                                                       $    1,205,615
                                                                                      ================
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-5

<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
          STATEMENT OF CHANGES IN NET ASSETS IN PROCESS OF LIQUIDATION
            FOR THE PERIOD FROM DECEMBER 1, 1997 TO DECEMBER 31, 1997


<TABLE>
         <S>                                                                           <C>
         LIQUIDATION TRANSACTIONS:

              Increase (decrease) in net assets resulting from -
                Sales of oil and gas properties                                        $     (110,302)
                Net changes in other assets and liabilities                                  (286,593)
                                                                                       ---------------
                                                                                             (396,895)
                                                                                       ---------------

         OPERATIONS:

              Oil and gas sales                                                        $       21,418
              Lease operating costs                                                            (3,596)
              Production taxes                                                                 (1,552)
              General and administrative costs                                                  7,045
                                                                                       ---------------
                                                                                               23,315
                                                                                       ---------------

         FINANCING:

              Interest income                                                                      --
              Interest expense                                                                     --
                                                                                       ---------------

              Change in Net Assets                                                           (373,580)

              Net Assets in Process of Liquidation at December 1, 1997                      1,791,496
                                                                                       ---------------
              Net Assets in Process of Liquidation at December 31, 1997                $     1,417,916
                                                                                       ===============
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-6


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                            STATEMENTS OF OPERATIONS
        FOR THE PERIOD FROM JANUARY 1, 1997 THROUGH NOVEMBER 30, 1997 AND
                 FOR THE YEARS ENDED DECEMBER 31, 1996 AND 1995

<TABLE>
<CAPTION>
                                                                 Eleven Months        Year              Year
                                                                    Ended             Ended             Ended
                                                                  November 30,     December 31,      December 31,
                                                                     1997              1996             1995
                                                                ---------------  ---------------   ---------------
<S>                                                             <C>               <C>              <C>
REVENUES:
   Oil and gas sales                                            $       407,804   $      668,937   $       614,169
   Interest income                                                           60               94               187
   Other                                                                  1,502            3,093             3,541
                                                                ---------------  ---------------   ---------------
                                                                        409,366          672,124           617,897
                                                                ---------------  ---------------   ---------------

COSTS AND EXPENSES:
   Lease operating                                                      137,985          199,839           251,627
   Production taxes                                                      19,844           42,747            40,204
   Depreciation, depletion
     and amortization -
        Normal provision                                                126,732          236,648           236,382
        Additional provision                                                 --               --           417,905
   General and administrative                                            72,589          100,780            69,371
   Interest expense                                                       5,630           26,422            63,149
                                                                ---------------  ---------------   ---------------
                                                                        362,780          606,436         1,078,638
                                                                ---------------  ---------------   ---------------
Income (Loss) Before Adoption
   Of Liquidation Basis Of Acccounting                          $        46,586  $        65,688   $      (460,741)
                                                                ---------------  ---------------   ---------------

Effect Of Adoption Of Liquidation
   Basis Of Accounting                                                  960,485               --                --
                                                                ---------------  ---------------   ---------------

Income (Loss)                                                   $     1,007,071  $        65,688   $      (460,741)
                                                                ===============  ===============   ===============
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-7


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                         STATEMENTS OF PARTNERS' CAPITAL
          FOR THE PERIOD FROM JANUARY 1, 1997 THROUGH NOVEMER 30, 1997
               AND FOR THE YEARS ENDED DECEMBER 31, 1996 AND 1995

<TABLE>
<CAPTION>
                                                  Limited          General          Combining
                                                  Partners         Partners         Adjustment           Total
                                              ---------------   ---------------  ---------------    ---------------
<S>                                           <C>               <C>              <C>                 <C>
Balance,
    December 31, 1994                         $     1,298,728   $        78,474  $       187,883     $    1,565,085

Income (Loss)                                        (417,253)           18,717          (62,205)          (460,741)

Cash Distributions                                    (72,700)          (23,581)              --            (96,281)
                                              ---------------   ---------------  ---------------    ---------------
Balance,
    December 31, 1995                                 808,775            73,610          125,678          1,008,063
                                              ---------------   ---------------  ---------------    ---------------

Income (Loss)                                          62,424            23,121          (19,857)            65,688

Cash Distributions                                   (140,000)          (34,103)              --           (174,103)
                                              ---------------   ---------------  ---------------    ---------------
Balance,
    December 31, 1996                                 731,199            62,628          105,821            899,648
                                              ---------------   ---------------  ---------------    ---------------

Income (Loss)                                         912,650           107,601          (13,180)         1,007,071

Cash Distributions                                    (85,500)          (29,723)              --           (115,223)
                                              ---------------   ---------------  ---------------    ---------------
Balance,
    Novmeber 30, 1997                         $     1,558,349   $       140,506  $        92,641     $    1,791,496
                                              ===============   ===============  ===============    ===============

Limited Partners' net income (loss)
    per unit

      1995     Income (Loss)                  $         (7.33)
                                                 ============
      1996     Income (Loss)                  $          1.10
                                                 ============
      1997     Income (Loss) Before
                   Adoption Of Liquidation
                   Basis Of Accounting        $           .85
                                              ---------------
                   Effect Of Adoption Of
                   Liquidation Basis Of
                   Accounting                 $         15.17
                                              ---------------
                   Income (Loss)              $         16.02
                                              ===============
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-8

<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                            STATEMENTS OF CASH FLOWS
         FOR THE PERIOD FROM JANUARY 1, 1997 THROUGH NOVEMBER 30, 1997
               AND FOR THE YEARS ENDED DECEMBER 31, 1996 AND 1995

<TABLE>
<CAPTION>
                                                                             Eleven Months         Year             Year
                                                                                 Ended             Ended            Ended
                                                                              November 30,      December 31,     December 31,
                                                                                 1997              1996             1995
                                                                            ---------------   ---------------  ---------------
<S>                                                                         <C>               <C>              <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
    Income (Loss)                                                           $     1,007 071   $        65,688  $      (460,741)
    Adjustments to reconcile income (loss) to
      net cash provided by operations:
      Effect of adoption of liquidation basis of accounting                        (960,485)               --               --
      Depreciation, depletion and amortization                                      126,732           236,648          654,287
      Change in gas imbalance receivable
          and deferred revenues                                                         228            78,711            3,721
      Change in assets and liabilities:
        (Increase) decrease in oil and gas sales receivable                        (201,849)           29,585          (13,809)
        Increase (decrease) in accounts payable                                    (243,118)         (606,340)          98,590
                                                                            ---------------   ---------------  ---------------
                  Net cash provided by (used in) operating activities              (271,421)         (195,708)         282,048
                                                                            ---------------   ---------------  ---------------
CASH FLOWS FROM INVESTING ACTIVITIES:
    Additions to oil and gas properties                                                  --           (93,600)         (51,581)
    Proceeds from sales of oil and gas properties                                   386,694           496,160              863
                                                                            ---------------   ---------------  ---------------
                  Net cash provided by (used in) investing activities               386,694           402,560          (50,718)
                                                                            ---------------   ---------------  ---------------
CASH FLOWS FROM FINANCING ACTIVITIES:
    Cash distributions to partners                                                 (115,223)         (174,103)         (96,281)
    Payments on note payable                                                             --           (33,665)        (134,659)
                                                                            ---------------   ---------------  ---------------
                  Net cash provided by (used in) financing activities              (115,223)         (207,768)        (230,940)
                                                                            ---------------   ---------------  ---------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                     50              (916)             390
                                                                            ---------------   ---------------  ---------------
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD                                      1,129             2,045            1,655
                                                                            ---------------   ---------------  ---------------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                                  $         1,179   $         1,129  $         2,045
                                                                            ===============   ===============  ===============
  Supplemental disclosure of cash flow information:
    Cash paid during the period for interest                                $         5,630   $        26,982  $        65,280
                                                                            ===============   ===============  ===============
</TABLE>


                 See accompanying notes to financial statements.

                                      IV-9

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                          NOTES TO FINANCIAL STATEMENTS


(1) Organization and Terms of Partnership Agreement -

         Swift Energy Income Partners 1990-C,  Ltd., a Texas limited partnership
("the  Partnership"),  was formed on  September  30,  1990,  for the  purpose of
purchasing and operating producing oil and gas properties within the continental
United States.  Swift Energy Company  ("Swift"),  a Texas  corporation,  and VJM
Corporation ("VJM"), a California corporation, serve as Managing General Partner
and  Special  General  Partner of the  Partnership,  respectively.  The  general
partners  are  required  to  contribute  up to 1/99th  of  limited  partner  net
contributions.  The 539 limited  partners  made total capital  contributions  of
$5,695,200.

         The limited partners of the Partnership approved the dissolution of the
Partnership on November 25, 1997. As a result,  the  Partnership has changed its
basis of accounting,  effective December 1, 1997, from the historical cost basis
to the  liquidation  basis.  Under  the  liquidation  basis of  accounting,  the
Partnership's  assets  at  December  31,  1997 are  reported  at  estimated  net
realizable value, and the  Partnership's  liabilities are presented at estimated
settlement  amounts.  The net  effect of the  revaluation  of the  Partnership's
assets  and  liabilities  due  to  the  adoption  of the  liquidation  basis  of
accounting was an upward adjustment of $960,485.

         Oil and gas  properties  at  December  31, 1997  reflect  the  managing
general partner's estimate of value, in the absence of third party appraisals or
evaluations, based on future net revenues of the properties,  discounted at 10%,
as of December 31, 1997.  This estimate is based on its assessment of the impact
of selling  existing  assets based on current  market  conditions  and estimated
disposal  costs.  The net proceeds from the sales of oil and gas  properties may
vary substantially due to changes in oil and gas prices,  subsequent  production
and other factors which may be applied by buyers.

         For all other assets and liabilities presented on the liquidation basis
of  accounting,  the managing  general  partner  believes that  historical  cost
approximates  fair  value  due to the  short-term  nature  of  such  assets  and
liabilities.

         The accompanying  statements of operations,  partners' capital and cash
flows for the  period  from  January  1, 1997  through  November  30,  1997 were
prepared using the historical cost basis of accounting.

(2) Significant Accounting Policies -

Use of Estimates --

         The  preparation of financial  statements in conformity  with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that affect the reported  amounts of assets and  liabilities at the
date of the  financial  statements  and the  reported  amounts of  revenues  and
expenses  during  the  reporting  period.   Actual  results  could  differ  from
estimates.

Oil and Gas Properties --

         The  Partnership  accounts  for its  ownership  interest in oil and gas
properties   using  the   proportionate   consolidation   method,   whereby  the
Partnership's share of assets, liabilities, revenues and expenses is included in
the appropriate classification in the financial statements.

         For  financial   reporting   purposes,   the  Partnership  follows  the
"full-cost"  method of  accounting  for oil and gas property  costs.  Under this
method of accounting,  all productive  and  nonproductive  costs incurred in the
acquisition and development of oil and gas reserves are capitalized.  Such costs
include lease  acquisitions,  geological  and  geophysical  services,  drilling,
completion,  equipment and certain  general and  administrative  costs  directly
associated   with   acquisition   and   development   activities.   General  and
administrative  costs related to production and general overhead are expensed as
incurred.  No general and administrative costs were capitalized during the years
ended December 31, 1997, 1996 and 1995.

                                     IV-10

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


         Future  development,  site  restoration,  dismantlement and abandonment
costs,  net of salvage  values,  are estimated on a  property-by-property  basis
based on  current  economic  conditions  and are  amortized  to  expense  as the
Partnership's capitalized oil and gas property costs are amortized.

         The  unamortized  cost of oil  and gas  properties  is  limited  to the
"ceiling  limitation",  (calculated  separately  for  the  Partnership,  limited
partners,  and general  partners).  The "ceiling  limitation" is calculated on a
quarterly  basis and  represents  the estimated  future net revenues from proved
properties  using current prices,  discounted at ten percent.  Proceeds from the
sale or  disposition of oil and gas properties are treated as a reduction of oil
and gas  property  costs  with no gains or  losses  being  recognized  except in
significant transactions.

         The Partnership computes the provision for depreciation,  depletion and
amortization of oil and gas properties on the units-of-production  method. Under
this method,  the provision is calculated by multiplying  the total  unamortized
cost of oil and gas properties,  including future development, site restoration,
dismantlement  and abandonment  costs, by an overall  amortization  rate that is
determined  by dividing  the physical  units of oil and gas produced  during the
period  by the  total  estimated  units of proved  oil and gas  reserves  at the
beginning of the period.

         The  calculation  of the "ceiling  limitation"  and the  provision  for
depreciation,  depletion,  and  amortization  is based on  estimates  of  proved
reserves.  There are numerous uncertainties inherent in estimating quantities of
proved  reserves and in projecting  the future rates of  production,  timing and
plan of development.  The accuracy of any reserve  estimate is a function of the
quality of available data and of engineering and geological  interpretation  and
judgment.  Results of drilling, testing and production subsequent to the date of
the  estimate  may  justify  revision  of such  estimate.  Accordingly,  reserve
estimates  are  often  different  from  the  quantities  of oil and gas that are
ultimately recovered.

Cash and Cash Equivalents --

         Highly liquid debt instruments with an initial maturity of three months
or less are considered to be cash equivalents.

Reclassifications --

         Certain  reclassifications have been made to the prior year balances to
conform with the current year presentation.

(3) Oil and Gas Capitalized Costs -

         The  following  table sets forth  capital  expenditures  related to the
Partnership's oil and gas operations:

<TABLE>
<CAPTION>
                                     Year Ended December 31,
                            -----------------------------------------
                             1997             1996             1995
                            --------         -------         --------
    <S>                    <C>             <C>              <C>
    Acquisition of
      proved properties    $      --       $      --        $      --

    Development                   --          93,600           51,581
                            --------         -------         --------
                           $      --       $  93,600        $  51,581
                            --------         -------         --------
</TABLE>


         All oil and gas  property  acquisitions  are made by Swift on behalf of
the Partnership. The costs of the properties include the purchase price plus any
costs incurred by Swift in the evaluation and acquisition of properties.

                                      IV-11

<PAGE>

                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


         During 1995, the  Partnership's  unamortized oil and gas property costs
exceeded the quarterly  calculations of the "ceiling limitation" resulting in an
additional  provision for depreciation,  depletion and amortization of $417,905.
In addition,  the limited  partners'  share of unamortized  oil and gas property
costs  exceeded their  "ceiling  limitation"  in 1995,  resulting in a valuation
allowance of $370,152. This amount is included in the income (loss) attributable
to the limited  partners  shown in the statement of partners'  capital  together
with a "combining  adjustment" for the difference  between the limited partners'
valuation  allowance and the  Partnership's  full cost ceiling  write down.  The
"combining   adjustment"   changes   quarterly   as  the   Partnership's   total
depreciation,  depletion  and  amortization  provision  is more or less than the
combined depreciation,  depletion and amortization provision attributable to the
general and limited partners.

(4) Related-Party Transactions -

         An  affiliate  of the  Special  General  Partner,  as  Dealer  Manager,
received   $141,508  for  managing  and   overseeing  the  offering  of  limited
partnership units.

     A  one-time  management  fee of  $142,380  was  paid to  Swift  in 1990 for
services  performed  for the  Partnership.  During  1997,  1996  and  1995,  the
Partnership paid Swift $34,044, $78,034 and $46,966,  respectively, as a general
and administrative overhead allowance.

         Effective  September  30,  1990,  the  Partnership  entered  into a Net
Profits and Overriding Royalty Interest Agreement ("NP/OR Agreement") with Swift
Energy Managed Pension Assets Partnership 1990-C, Ltd. ("Pension  Partnership"),
managed by Swift for the purpose of acquiring working interests in producing oil
and gas properties.  Under the terms of the NP/OR Agreement, the Partnership has
conveyed to the Pension Partnership a nonoperating interest in the aggregate net
profits  (i.e.,  oil  and gas  sales  net of  related  operating  costs)  of the
properties acquired equal to its proportionate share of the property acquisition
costs.

(5) Federal Income Taxes -

         The Partnership is not a tax-paying entity. No provision is made in the
accounts of the Partnership for federal or state income taxes,  since such taxes
are liabilities of the individual partners,  and the amounts thereof depend upon
their respective tax situations.

         The tax returns and the amount of distributable  Partnership income are
subject to  examination  by the federal  and state  taxing  authorities.  If the
Partnership's  ordinary  income for federal  income tax  purposes is  ultimately
changed by the taxing  authorities,  the tax  liability of the limited  partners
could be changed  accordingly.  Ordinary  income  reported on the  Partnership's
federal  return of income for the years ended  December 31, 1997,  1996 and 1995
was  $380,113,  $429,938 and  $202,609,  respectively.  The  difference  between
ordinary income for federal income tax purposes  reported by the Partnership and
net income or loss  reported  herein  primarily  results  from the  exclusion of
depletion  (as  described   below)  from   ordinary   income   reported  in  the
Partnership's federal return of income.

         For federal  income tax purposes,  depletion with respect to production
of  oil  and  gas  is  computed  separately  by  the  partners  and  not  by the
Partnership.  Since the amount of depletion on the  production of oil and gas is
not  computed  at  the  Partnership  level,  depletion  is not  included  in the
Partnership's  income for federal income tax purposes but is charged directly to
the  partners'  capital  accounts  to the  extent  of the cost of the  leasehold
interests, and thus is treated as a separate item on the partners' Schedule K-1.
Depletion  for  federal  income tax  purposes  may vary from that  computed  for
financial reporting purposes in cases where a ceiling adjustment is recorded, as
such amount is not recognized for tax purposes.


                                      IV-12


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


(6) Gas Imbalances -

         The  Partnership  recognizes  its  ownership  interest  in natural  gas
production as revenue.  Actual production  quantities sold may be different than
the Partnership's  ownership share in a given period. If the Partnership's sales
exceed  its share of  production,  the  differences  are  recorded  as  deferred
revenue. Gas balancing receivables are recorded when the Partnership's ownership
share of production exceeds sales.

(7) Vulnerability Due to Certain Concentrations -

         The Partnership's revenues are primarily the result of sales of its oil
and natural gas  production.  Market prices of oil and natural gas may fluctuate
and adversely affect operating results.

         In the normal  course of  business,  the  Partnership  extends  credit,
primarily  in the form of  monthly  oil and gas sales  receivables,  to  various
companies in the oil and gas industry which results in a concentration of credit
risk. This  concentration  of credit risk may be affected by changes in economic
or other conditions and may accordingly impact the Partnership's  overall credit
risk. However,  the Managing General Partner believes that the risk is mitigated
by the size,  reputation,  and nature of the companies to which the  Partnership
extends  credit.  In  addition,  the  Partnership  generally  does  not  require
collateral or other security to support customer receivables.

(8) Fair Value of Financial Instruments -

         The  Partnership's  financial  instruments  consist  of cash  and  cash
equivalents  and  short-term  receivables  and  payables.  The carrying  amounts
approximate  fair  value  due to the  highly  liquid  nature  of the  short-term
instruments.


                                      IV-13


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD

                                   SIGNATURES



Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  Registrant  has duly  caused  this report to be signed on its
behalf by the undersigned thereunto duly authorized.


                                             SWIFT ENERGY INCOME
                                             PARTNERS 1990-C, LTD.
                                             (Registrant)

                                    By:      SWIFT ENERGY COMPANY
                                              General Partner

Date:      February 18, 1998                 By:      s/b A. Earl Swift
           -----------------                 -----------------------------------
                                             A. Earl Swift
                                             Chief Executive Officer

Date:      February 18, 1998                 By:      s/b John R. Alden
           -----------------                 -----------------------------------
                                             John R. Alden
                                             Principal Financial Officer

Date:      February 18, 1998                 By:      s/b Alton D. Heckaman, Jr.
           -----------------                 -----------------------------------
                                             Alton D. Heckaman, Jr.
                                             Principal Accounting Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following  persons on behalf of the  Registrant and
in the capacities and on the dates indicated.

                                             SWIFT ENERGY INCOME
                                             PARTNERS 1990-C, LTD.
                                             (Registrant)

                                    By:      SWIFT ENERGY COMPANY
                                              General Partner

Date:     February 18, 1998                  By:      s/b A. Earl Swift
          -----------------                  -----------------------------------
                                             A. Earl Swift
                                             Director and Principal
                                             Executive Officer

Date:     February 18, 1998                  By:      s/b Virgil N. Swift
          -----------------                  -----------------------------------
                                             Virgil N. Swift
                                             Director and Executive
                                             Vice President - Business
                                             Development


                                      IV-14


<PAGE>


                    SWIFT ENERGY INCOME PARTNERS 1990-C, LTD


Date:      February 18, 1998                 By:      s/b G. Robert Evans
           -----------------                 -----------------------------------
                                             G. Robert Evans
                                             Director

Date:      February 18, 1998                 By:      s/b Raymond O. Loen
           -----------------                 -----------------------------------
                                             Raymond O. Loen
                                             Director

Date:      February 18, 1998                 By:      s/b Henry C. Montgomery
           -----------------                 -----------------------------------
                                             Henry C. Montgomery
                                             Director

Date:      February 18, 1998                 By:      s/b Clyde W. Smith, Jr.
           -----------------                 -----------------------------------
                                             Clyde W. Smith, Jr.
                                             Director

Date:      February 18, 1998                 By:      s/b Harold J. Withrow
           -----------------                 -----------------------------------
                                             Harold J. Withrow
                                             Director


                                      IV-15