Lake Sherburne

2002 Survey

-

U.S. Department of the Interior

Bureau of Reclamation

Technical Service Center

Denver, Colorado September 2005
REPORT DOCUMENTATION PAGE Fonri Approved

0MB No. 0704-0188

AGENCY USE ONLY (Leave flank) 2. REPORI' DA'I'L 3. REPORT TYPE AND DATES COVERED

September 200. Final _______________________________

4. TITLE AND SUBTITLE . FUNDING NUMBERS

Lake Sherburne PR

2002 Survey _____________________________

6. AUTHOR(S)

Ronald L. Ferrari and Sharon Nuanes ____________________________

7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) S. PERFORMING ORGANIZATION

Bureau of Reclamation, Technical Service Center, I)enver CO 80225-0007 REPORT NUMBER

9. SPONSORING/MONI'I'ORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONI'I'ORING

Bureau of Reclamation, Denver Federal Center. P0 Box 25007, AGENCY REPORT NUMBER

Denver CO 80225-0007 DIBR

II. SUPPLEMENTARY NOTES

Hard copy available at Bureau of Reclamation Technical Service Center, Denver, Colorado

12a. DISTRIBUTION/AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE

13. ABSTRACT (Maxima/n 200 ii'ords)

The Bureau of Reclamation (Reclamation) surveyed Lake Sherburne in July of 2002 to develop a topographic map and compute

a present storage-elevation relationship (area-capacity tables). The underwater survey was conducted near lake elevation 4,786

feet (project datum). The underwater survey used sonic depth recording equipment interfaced with a global positioning system

(GPS) that gave continuous sounding positions throughout the underwater portions of the reservoir covered by the survey vessel.

The above-water topography was determined by digitizing a developed reservoir contour line from the U.S. Geological Survey

quadrangle (USGS quad) map of the reservoir area. The new topographic map of Lake Sherburne was developed from the

combined digitized contours and July 2002 underwater measured topography. This study assumed no change since the 1983

survey from elevation 4,790 (feet) and above.

As of July 2002, at maximum water surface elevation 4,810.0, the surface area was 2,163 acres with a total capacity of 108,980

acre-feet. Since initial survey results in 1948, about 343 acre-feet of change have been measured below conservation elevation

4,788.0. Since the 1983 survey, about 1,707 acre-feet of change was measured at elevation 4,788.0. It is assumed the majority

of the calculated differences are due to the methods of the surveys and vertical datum differences. It must be noted that the 2002

survey was conducted with a fairly stable survey vessel, but at times in rough water conditions.

14. SUBJECT TERMS 15. NUMBER OF PAGES

reservoir area and capacity/ sedimentation! reservoir surveys/ sonar/ sediment distribution! _______________________

contour area! reservoir area! sedimentation survey/ global positioning system! lake 16. PRICE CODE

17. SECURITY 18. SECURITY 19. SECURITY CLASSIFICATION 20. LIMITATION OF

CLASSIFICATION CLASSIFICATION ABSTRACT

OF REPORT OF ABSTRACT

OF THIS PAGE

UL UL UL

UL _______________________ __________________

NSN 7540-01-280-5500 Standard Foim 298 (Rev. 2-89)

Prescribed by ANSi Sal. 239-i 8

298-102
Lake Sherburne

2002 Survey

Prepared by

Ronald L. Ferrari

U.S. Department of the Interior

Bureau of Reclamation

Technical Service Center

Water Resources Services

Sedimentation and River Hydraulics Group

Denver, Colorado September 2005
ACKNOWLEDGMENTS

Reclamations Sedimentation and River hydraulics Group of the Tecimical Service Center (TSC)

prepared and published this report. Ronald Ferrari of the TSC conducted the underwater data

collection and completed the data processing needed to generate the new topographic map. areacapacity tables and report. Kent Collins of the TSC performed the tecFmical peer review of this

documentation.

UNITED STATES DEPARTMENT OF THE

INTERIOR

The mission of the Department of the Interior is to protect

and provide access to our Nation's natural and cultural

heritage and honor our trust responsibilities to Indian tribes

and our commitments to island communities.

BUREAU OF RECLAMATION

The mission of the Bureau of Reclamation is to manage,

develop, and protect water and related resources in an

environmentally and economically sound manner in

the interest of the American public.

The information contained in this report regarding commercial products or firms may not be used

for advertising or promotional purposes and is not to be construed as an endorsement of any

product or firm by Reclamation.

The information contained in this report was developed for the Bureau of Reclamation; no

warranty as to the accuracy, usefulness, or completeness is expressed or implied.

11
CONTENTS

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Introduction 1

Summary and Conclusions 2

Reservoir Operations 3

1-lydrographic Survey Equipment and Method 3

Lake Sherburne Datum 4

Reservoir Area and Capacity 4

Topography Development 4

Development of 2002 Contour Areas 5

2002 Storage Capacity 5

Reservoir Survey Analyses 6

References 7

TABLES

Table

1 Reservoir sediment data summary (page 1 of 3) 9

1 Reservoir sediment data summary (page 2 of 3) 10

2 Summary of 2002 survey results 11

FIGURES

Figure

1 Lake Sherburne location map

2 Lake Sherbume topographic map 13

3 2002 area and capacity curves 15

111
INTRODUCTION 

Lake Sherburne Dam and Reservoir on Swiftcurrent Creek in Glacier County is about 5 miles 

southwest of Babb in northwest Montana (figure 1). The reservoir was formed on a natural lake 

and began storage behind the dam in 1919. The dam, reservoir, and facilities are part of the Milk 

River Project in north-central Montana that furnishes water for the irrigation of about 121,000 

acres of land. Additional features include Nelson and Fresno storage dams, diversion dams, a 

pumping plant, canals, and laterals. Lake Sherburne Dam and Reservoir are operated and 

maintained by Reclamation and all water supply and distribution works are operated and 

maintained by the irrigation districts. 

, Lab Shabuma MONTANA 

els 

\ ~e~~kwtai~ Afterbay 

Yellowtail 

Figure 1 - Iake Sherburne location map. 

Lake Sherburne Dam was initially constructed from 1914 through 1921 with a crest elevation of 

4,803.0 feet and raised 13.5 feet in 1982. The dam is a compacted earthfill structure whose 

dimensions are: 

Hydraulic height1 95 feet 

Top width 24 feet 

Crest elevation 4,816.5 feet2 

Structural height 108.5 feet 

Crest length 1,200 feet 

The spillway is a morning-glory structure around the outlet works tower where water flows over 

the crest, elevation 4,788.0, and through the tower into the outlet works conduit at the base of the 

tower. The outlet works, located under the right center portion of the dam, consists of the intake 

tower, trashracks, regulating gates, and riprap-lined outlet channel. The outlet discharge capacity 

1 The definition of such terms as "hydraulic height," "structural height," etc. may be found in manuals such as 

Reclamation's Design of Small Dams and Guide for Preparation of Standing Operating Procedures for Dam and 

Reservoirs, or ASCE's Nomenclature for Hydraulics. 

2~levation in feet All elevations shown in this report are based on the original project datum established by U.S. 

Bureau of Reclamation that was found to be 9.45 feet lower than the National Geodetic Vertical Datum of 1929 (NGVD29) 

and 13.75 feet lower than the North American Vertical Datum of 1988 (NAVD88). 
is 2,100 cubic feet per second (cfs) at spillway crest reservoir elevation 4,788.0. The maximum

combined discharge capacity of the spiliway and outlet works at maximum reservoir elevation

4,810.0 is 4,000 cfs.

The drainage area above Sherbume Dam is 63.7 square miles and the basin elevations range over

9,000 feet on the Continental Divide. The basin perimeter is steep bedrock slopes and the lower

elevations are timber-covered valleys. For this study, the majority of the basin is considered

non-sediment contributing due to the upstream lakes located oti Swiftcurrent Creek. Lake

Sherburne is around 6.4 miles in length and around 0.5 miles in width.

SUMMARY AND CONCLUSIONS

This Reclamation report presents the 2002 results of the survey of Lake Sherburne. The primary

objectives of the survey were to gather data needed to:

• develop reservoir topography

• compute area-capacity relationships

A Real-time Kinematic (RTK) GPS control survey was conducted to establish a temporary

horizontal and vertical control point near where the boat was launched for the reservoir survey.

The RTK GPS control survey was conducted with the base set on the National Geodetic Survey

(NGS) datum point "Sherbume 1" located downstream of the dam on the outlet structure. The

horizontal control was established in the Montana state plane coordinate zone in the North

American Datum of 1983 (NAD83) and the vertical control was tied to the North American

Vertical Datum of 1988 (NAVD88) and the Reclamation project datum. All elevations in this

report are referenced to the Reclamation project or construction datum. A previous Reclamation

regional survey determined the project datum was 13.75 feet lower than the NAVD88 and 9.45

feet lower than the NGVD29.

The underwater survey was conducted in July of 2002 near reservoir water surface elevation

4,786. The bathymetric survey used sonic depth recording equipment interfaced with RTK GPS

making it capable of determining sounding locations within the reservoir. The system

continuously recorded depth and horizontal coordinates of the survey boat as it navigated along

grid lines covering Lake Sherburne. The positioning system provided information to allow the

boat operator to maintain a course along these grid lines. Water surface elevations recorded by

the reservoir gauge (tied to the Reclamation vertical datum) during the time of collection were

used to convert the sonic depth measurements to true reservoir bottom elevations. The abovewater topography was determined by digitizing a developed contour line from the U.S.

Geological Survey quadrangle (USGS quad) maps of the reservoir area.

The 2002 Lake Sherbume map is a combination of the USGS quad contour and the underwater

survey data. A computer graphics program using the collected reservoir data generated the 2002

reservoir surface areas at predetermined contour intervals. The 2002 area and capacity tables

were produced by a computer program that uses measured contour surface areas and a curvefitting technique to compute area and capacity at prescribed elevation increments (Bureau of

Reclamation, 1985).

2
Tables 1 and 2 contain summaries of the Lake Sherburne and watershed characteristics for the

2002 survey. The 2002 survey determined that the reservoir has a total storage capacity of

66,147 acre-feet and a surface area of 1,719 acres at active conservation elevation 4,788.0. Since

the 1983 survey, the 2002 survey estimates a volume difference of 1,707 acre-feet below

reservoir elevation 4,788.0. Since the 1948 survey results, the 2002 survey estimates a volume

difference of 343 acre-feet below reservoir 4,788.0. It is assumed the majority of the calculated

differences are due to the method of the surveys and different vertical datums.

RESERVOIR OPERATIONS

Lake Sherburne is part of the Milk River Project that includes Fresno and Nelson Reservoirs and

supplies water for irrigating 121,000 acres of land in north-central Montana. The July 2002

capacity table shows 108,980 acre-feet of total storage below the maximum water surface

elevation 4,810.0. The 2002 survey measured a minimum lake bottom elevation of4,719.8. The

following values are from the July 2002 capacity table:

• 42,833 acre-feet of surcharge elevation 4,788.0 and 4,810.0.

• 64,248 acre-feet of conservation use between elevation 4,729.3 and 4,788.0.

• 1,899 acre-foot of dead storage below 4,729.3.

Lake Sherbume readily available inflow and end-of-month stage records in table 1, operation

period 1955 through 2002, show the calculated inflow and annual fluctuation for these years of

operation. The computed average inflow into the reservoir for these years was 142,700 acre-feet

per year. The maximum-recorded elevation was 4,788.3 in 1986 and 1990 with minimumrecorded 4,730.5 in 1999.

HYDROGRAPI{IC SURVEY EQUIPMENT AND METHOD

The hydrographic survey equipment was mounted in a large aluminum vessel equipped with an

outboard motor supplied by the Tiber Reservoir operation office. The hydrographic system

included a GPS receiver with a built-in radio, a depth sounder, a helmsman display for

navigation, a computer, and hydrographic system software for collecting the underwater data.

The shore equipment included a second GPS receiver with an external radio. The GPS receiver

and antenna were mounted on a survey tripod over a known datum point. Batteries supplied

power to all the equipment.

The Sedimentation and River Hydraulics Group uses RTK GPS with the major benefit being

precise heights measured in real time to monitor water surface elevation changes. The basic

outputs from an RTK receiver are precise 3D coordinates in latitude, longitude, and height with

accuracies on the order of two centimeters horizontally and three centimeters vertically. The

output is on the GPS datum of WGS-84 that the hydrographic collection software converted into

Montana's NAD83 state plane coordinate system. The RTK GPS system employs two receivers

that track the same satellites simultaneously just like with differential GPS.

3
Lake Sherburne hydrographic survey was conducted on July 23 through 25 of 2002 near water

surface elevation 4,786 (Reclamation project datum). The bathymetric survey was run using

sonic depth recording equipment, interfaced with an RTK GPS, capable of determining sounding

locations within the reservoir. The survey system software continuously recorded reservoir

depths and horizontal coordinates as the survey boat moved across closely spaced grid hues

covering the reservoir area. Most of the transects (grid lines) were run in a north-south

alignment on the reservoir at around 200-foot spacing. The detail of collection in the lower

portion of the reservoir was affected by afternoon high wind conditions and survey vessel

problems. Data was also collected along the shore as the boat traversed between transects. The

survey vessel's guidance system gave directions to the boat operator to assist in maintaining the

course along these predetermined lines. During each run, the depth and position data were

recorded on the notebook computer hard drive for subsequent processing.

Lake Sherburne Datum

A previous control survey determined that the Reclamation project datum is 13.75 feet lower

than NAVD88 and 9.45 feet lower than NGVD29. All elevations in this report are tied to the

Reclamation water surface elevations measured by the Reclamation gauge during the time of the

July 2002 collection.

RESERVOIR AREA AND CAPACITY

Topography Development

The topography of Lake Sherburne was developed from the 2002 collected underwater and a

digitized contour from the USGS quad maps. The digitized USGS contour line was the Lake

Sherburne water surface that was labeled with an elevation of 4,788. The USGS quad maps were

developed from aerial photography dated 1966. This study found the enclosed digitized contour

area to correspond the 1983 surface area at elevation 4,788.2. ARC/INFO geographic

information system software was used to digitize the USGS quad contour. The digitized contour

was transformed to Montana's NAD 1983 state plane coordinates using the ARC/INFO

PROJECT command.

The mapping was completed using ArcGIS version 8.3. Using ArcMap, the underwater data

points and digitized contour line developed a triangular irregular network (TIN) of Lake

Sherburne such that interpolation was not allowed to occur outside the enclosed polygon. This

contour was selected since it was the only available data to represent the reservoir water surface

at the time the survey was conducted (near reservoir elevation 4,786). Using ArcMap, the

underwater collected data and digitized contour from the quad maps were plotted. The plot

showed that the underwater data did not lie completely within this clip and required small

modifications along the shoreline to include the entire underwater data set. Using edit

commands the vertices of the clip were shifted to fit all the collected underwater data. The clip

was assigned an elevation of 4,788.2 to reflect the 1983 surface area of the new polygon.

Contours for the reservoir below elevation 4,788.2 were computed from the underwater data set

using the triangular irregular network (TIN) surface-modeling package within ARC/INFO. A

4
TIN is a set oladjacent non-overlapping triangles computed from irregularly spaced points with

x,y coordinates and z values. TIN was designed to deal with continuous data such as elevations.

The TIN software uses a method known as Delaunay's criteria for triangulation where triangles

are formed among all data points within the polygon clip. The method requires that a circle

drawn through the three nodes of a triangle will contain no other point, meaning that sample

points are connected to their nearest neighbors to form triangles using all collected data. This

method preserves all collected survey points. Elevation contours are then interpolated along the

triangle elements. The TIN method is discussed in greater detail in the ARC/INFO V7.0.2 Users

Documentation, (ESRI, 1992).

The linear interpolation option of ArcMap was used to interpolate contours from the Lake

Sherburne TIN. In addition, the contours were generalized by filtering out vertices along the

contours. This generalization process improved the presentability of the resulting contours by

removing very small variations in the contour lines. This generalization had no bearing on the

computation of surface areas and volumes for Lake Sherburne since the areas were calculated

from the developed TIN. The areas of the enclosed contour polygons at two-foot increments

were developed from the survey data for elevations 4,720.0 through 4,788.0. The 2002 study

assumed no change in area since the 1983 survey for elevation 4,790.0 and above. The contour

topography at 5-foot intervals is presented on figure 2.

Development of 2002 Contour Areas

The 2002 contour surface areas for Lake Sherburne were computed at 2-foot increments from

elevation 4,720.0 to 4,788.0. The 2002 underwater survey measured a minimum reservoir

bottom elevation of 4,7 19.8. These calculations were performed using the ARC/INFO

VOLUME command. This command computes areas at user-specified elevations directly from

the TIN and takes into consideration all regions of equal elevation. As indicated above, the 2002

underwater survey data was collected near reservoir elevation 4,786. For the purpose of this

study, the measured 2002 survey areas at 2-foot increments from elevation 4,720.0 through

4,788.0 were used to compute the new area and capacity tables. The measured 5-foot surface

areas from the 1983 survey for elevations 4,790.0 through 4,810.0 were used to complete the

2002 table. The 2002 study assumed no change since the 1983 survey from elevation 4,790.0

and above. It must be noted that the 1983 survey determined a control error from the 1972

survey results from elevation 4,785.0 and above.

2002 Storage Capacity

The storage-elevation relationships based on the measured surface areas were developed using

the area-capacity computer program ACAP85 (Bureau of Reclamation, 1985). The 2002

surveyed surface areas at 2-foot contour intervals from reservoir elevation 4,720.0 to elevation

4,788.0 were used as the control parameters for computing the 2002 Lake Sherburne capacity.

Since this study did not collect above water data, the 1983 survey 5-foot surface areas from

elevation 4,790.0 to 4,810.0 were used to complete the area and capacity table.

The ACAP85 program can compute an area and capacity at elevation increments 0.01- to 1.0-

foot by linear interpolation between the given contour surface areas. The program begins by

testing the initial capacity equation over successive intervals to ensure that the equation fits

5
within an allowable error limit. The error limit was set at 0.000001 for Lake Sherburne. The

capacity equation is then used over the full range of intervals fitting within this allowable error

limit. For the first interval at which the initial allowable error limit is exceeded, a new capacity

equation (integrated from a basic area curve over that interval) is utilized until it exceeds the

error limit. Thus, the capacity curve is defined by a series of curves, each fitting a certain region

of data. By differentiating the capacity equations, which are of second order polynomial form,

the final area equations are derived:

y = a1 ± a2x a3x2

where: y = capacity

x = elevation above a reference base

a = intercept

a. and a = coefficients

Results of the Lake Sherburne area and capacity computations are listed in table 1 and colunms 8

and 9 of table 2. On table 2, columns 2 and 3 list the 1948 surface areas and capacity values. A

separate set of 2002 area and capacity tables has been published for the 0.01, 0.1 and 1-foot

elevation increments (Bureau of Reclamation, July 2002). A description of the computations and

coefficients output from the ACAP85 program is included with these tables. Both the original

and 2002 area-capacity curves are plotted on figure 3. As of July 2002, at elevation 4,810.0, the

surface area was 2,163 acres with a total capacity of 108,980 acre-feet.

RESERVOIR SURVEY ANALYSES

Figure 3 is a plot of Lake Sherburne 1948, 1972, 1983 surface area and capacity versus the 2002

measured surface area and capacity that illustrates the differences between all the surveys. Since

Lake Sherbume closure in 1919, the measured total volume change at reservoir elevation 4,788.0

was estimated to be 343 acre-feet between the 1948 and 2002 surveys and 1,707 acre-feet

between 1983 and 2002 surveys. Due to the upstream lakes, the loss due to sediment deposition

in Lake Sherburne should be minimal so it is assumed the volume differences between the

surveys are due to the different survey methods and the differences in the vertical datums.

For the 2002 analysis, there was little detailed history on the previous surveys of Lake

Sherburne. On drawing number 15-600-95, it is noted the 1972 survey was a joint venture

between Reclamation and Canada where the lake was surveyed up to elevation 4,803. In 1980

and 1981, Reclamation completed the survey of the reservoir from elevation 4,803 through

elevation 4,810. The drawing also notes that the 1972 curves were adjusted from elevation 4,785

and above when a 1983 survey determined there was a survey control error. It must be noted

that the 2002 area and capacity tables were generated assuming no change in the 1983 surface

area values from elevation 4,790 and above which in all probability is not the case, but was the

best information available to complete the 2002 area and capacity calculations.

A resurvey of Lake Sherburne should be considered in the future if a better understanding of the

total volume is needed and if the resurvey consists of both above and below water collection.

6
REFERENCES

American Society of Civil Engineers, 1962. Nomen clature for Hydraulics, ASCE Headquarters,

New York.

Bureau of Reclamation, 1981. Project Data, Denver Office, Denver CO.

Bureau of Reclamation, 1985. Surface Water Branch, ACAP8S User's Manual, Tecimical

Service Center, Denver CO.

Bureau of Reclamation, 1987(a). Guide for Preparation ofStanding Operating Procedures for

Bureau of Reclamation Dams and Reservoirs, U.S. Government Printing Office, Denver, CO.

Bureau of Reclamation, 1987(b). Design of Small Dams, U.S. Government Printing Office,

Denver CO.

Bureau of Reclamation, July 2002. Denver Office, Lake Sherburne Area and Capacity Tables,

Milk River Project, Great Plains Region, Billings, MT.

Corps of Engineers, January 2002. Engineer and Design - Hydrographic Surveying,

EM 11 10-2-1003, Department of the Army, Washington DC,

(www.usace.army.mil/inet/usace-docs/eng-manuals/em 1110-2-1 003/toc.htm).

Environmental Systems Research Institute, inc. (ESRI), 1992. ARC Command References.

7

RESERVOIR SEDIMENT

DATA SUMMARY Lake She rburne

NAME OF RESERVOIR 1

DATA SHEET NC.

D . OWER Lunean of Recan.:(Io 2 STREAM Swiftcurrert Creen 3 STATE Montana

A 4. SEC. 3 TWO . 35 N INI M 5. NEAREST P.O. Babb 91. COUNTY G1acler

M 7. LAN 48 49 42" LONG 113 Ii 14" 8. TOP OF DAN Eevation 4,511.5- 9. SPILLWAY CREST EL 4,788.O

R 10. STORAGC .3. ELEVATION 1.2 2002 13. 2002 4. GROSS 15. DATE

E ALLOCAT:oN TOP POLL SURFACE AREA, CAPACITY, AR STORAGE ACRE- STORAGE

S AC FEET BEGAN

E a. SURCHARGE 4,810.0 2,163 42,833 108,980

Ii b. FLOOD CONTROL

V

o

C, POWER

1911

S. JOINT TOSS _______________

.6. DATE

p. e. CONSERVATION 4,7iT90 1,719 05,338 53,147 NORMAL

6. INACEIVE OPERATION

g. DEAD 4,72-1. 444 1,890 1,899

- 17. lENGTH OP PF.SERVOTR F FlIES AVG WTOTH OR RESERVOIR 0

_____________

TFTT,RS

B 19. TOTAL DRAINAGE AREA 63.7 SQUARE MILES 22. MEAN ANNUAL PRECIPITATION l3 INCHES

A 19. NET SHIIIMENT CONTRIBUTING AREA 2S SQUARE MILES 23. MEAN ANNUAL RUNOFF 43,76 INCHES

S 20. LENGTH MILES AV. WIDTH 24. MEAN ANNUAL RUNOFF 142,700 ACRE-FEET

21. MAX. ELEVATION WIN. ELEVATION 25. ANNUAL TEMP. MEAN 42"F RANGE -55 "F to 109"F4

26. DATE OF 27. 28. 29. TYPE OF 30. NO. OF 31. SURFACE 32. CAPACITY 33. C/I

U SURVEY PER. ACCL SURVEY P.ANGES OR AREA, AC. ACRE-FEET RATIO

R _____________________________________________

V

_________________

E 1948 1,730 66,490

Y 1972 1,501 57,604

1993 1,718 67,854

O 7/02 Contour D: 2-ft 1,7198 661478 0.46

A 25. DATE OF 34. PERIOD 35. PERIOD WATER INFLOW, ACRE FEET WATER INFLOW TO DATE, AF

T SURVEY ANNUAL __________________________________________________

A PRECIP. a. MEAN AWE. b. MAX. ANN. J

c. TOTAL

__________________

a. MEAN ANN. J

_______________

H. TOTAL

7/02 142,700" 209,800 6,ESC,000 142,700 5,850,000

26. DATE OF 37. PERIOD CAPACITY LOSS, ACRE-FEET 38. TOTAL SEDIMENT DEPOSITS TO DATE, AF

SURVEY ____________________________________________________

a. TOTAL b. AV. ANN. J

C. /MI.-YR.

______________

a. TOTAL

___

J

____________________

b. AV. ANNUAL J

________________

C. /MI."-YR.

10

7/02

26. DATE OF 39. AV. DRY 40. SED. DEP. TONS/NIH-YR. 41. STORAGE LOSS, PCI. 42.

SURVEY MT. (#/FT") ____________________________

a. PERIOD H. TOTAL TO

___________

a. AV.

___________________

b. TOTAL TO

______

a.

______

b.

7/02

:0 10

26.

DATE

43. DEPTH DESIGNATION RANGE BY RESERVOIR ELEVATION

SURVE

_______________________________________________________________________

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

26.

DATE

44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

OF

SURVE

0-10 10-

20

20-

30

30-

40

40-

50

50-

60

60-

70

70-

80

80-

90

90-

LO0

1.091-

105

105-

110

110-

115

115-

:20

120-

225

Y PERCENT OF TOTAL SELOMENT LOCATED WITHIN REACH DES:GNAT:ON

Table 1. - Reservo.r sediment datN summary (page 1 of 2)

10
45. RANGE IN RE.OSRVCIR OPERATION8

YEAR 3AX. ROSy . MIN. ELEV. INFLOW, AF YEAR MAX. ELEV. MIN. ELEV. 101106W, A6

1954 4,783.9 4,732.8 _____________

:955 47833 4,732.

l95 785.0 4,733.' 72,600 1957 4,721.5 4,734.6

_____________

'' ,003

1958 6.78-.5 4,73.6 :7,lo0 1359 4,764.8 4,739.5 8,200

:960 1,712.7 4,732.2 137,2C0 .95: ,787.2 ,73l.2 7,40C

1962 3,772.9 4,731.6 126,:oc :9,3 4,793.6 4,7'3.1 r. 760

1964 1,784.4 4731.6 81,t.0, 106' 4,78,. 4,7'7.7 1,',70

1366 ,76.f 4,73C." 67,700 167 4,784. 4,730.:

1968 2,7945 4,732.4 :40,000 1969 ,727. 4,73.7

__________

1970 •,,797.0 4,701.' :42,700 107 4,767.9 4,73,.

__________

6572 ,787.2 4,738.3 192,800 1973 4,779.4 4,733.2

__________

1,0C

1574 '1,787. 4,737.4 20u,800 1975 ,787.: 4,735.4 .80,106

.976 1,78,.7 4,735.4 176,200 1977 4,753.7 4,736.1 32,000

1978 4,757.5 4,742.5 162,200 1979 4,781.2 4,735.0 120,000

1980 -'787.9 4,735.0 130,900 1921 4,787.8 4,731.7 :88,700

1962 1,766.7 4,731.7 149,000 1983 4,769.0 4,735.3 1l0,'00

1984 1,773.1 4,739.5 127,100 198' 4,783.2 4,732.: .'4,700

1986 1,788.3 4,73s,.6 157,300 1987 4,782.2 4,754.5 32, 00

1988 4,7711 4,730.6 98,800 1989 4,787.5 4,735.4 137,100

:990 4,788.3 4733.6 155,900 1991 4,788.2 4,744.5 197,500

:992 4,76- .1 4,731.3 96,000 1903 4,782... 4,746.5 117,300

1994 4,71r.8 4,732.1 108,300 1995 4,787.2 4,734.1 182,900

:996 4,787.8 4,747.8 177,603 1997 4,787.8 4,745.3 180,500

1998 4,787.7 4,735.1 114,200 1999 4,787.2 4,730.5 ..40,SCt

2000 4,773., 4,732.6 133,500 2001 4,762.4 4,730.9 35,700

_____________ 1787 7 '177' P 176 3611 _____________

46. ELEVATION AREA - CAPACITY DATA FOR 2002 CAPACITY"

ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY ELEVATION AREA CAPACITY

4,719.8 0 0 4,720 0 0 4,722 75 75

4,724 161 310 4,728 378 1,365 4,72-.2 444 1,899

4,730 481 2,223 4,732 545 3,249 4,734 612 ,405

4,736 66 5,678 4,738 707 7,046 4,740 742 6,494

4,742 77-' 10,015 4,744 820 11,614 '1,746 856 13,291

4,748 893 19,040 4,750 926 16,658 4,752 958 18,742

4,754 094 20,694 4,756 6,831 22,719 4,758 1,063 24,812

4,760 1,097 26,973 4,762 1,127 29,197 4,764 1,159 31,483

4,766 1,191 33,833 4,768 1,224 35,248 4,770 1,264 38,736

4,772 .,348 41,348 4,774 1,409 44,105 4,776 1,463 46,975

4,778 1,513 49,952 4,780 1,556 53,020 4,782 1,600 56,17,

4,784 1,43 59,419 4,682 1,682 62,745 4,788 1,719 66,147

4,790 1,762 69,628 4,795 1,817 78,711 4,800 1,970 58,313

4803 2029 94.310 4.810 2.163 304.480 __________ __________

47. REMARKS AND REFERENCES

All elevations are in feet and based on toe original project datum est ablished by Reclamation that were

found to be 13.75 feet lower than the NAVD88 and 9.45 feet lower than the NGVD29. Original top of car

elevat ion 4,603.0. Raised 13.5 feet in 1982.

Uncontrolled morning glory overflow apillway.

2002 values. Darn rai sed In 1982. Uncerta.nt:es in or...gi nal values.

Bureau of Rec1amaton Pro3ect Data Book, 1981. Values for Mlk River ProJect.

Several lakes and ponds upstream of Lake Sherburne. Est: mateO they control 60% of sediment inflow.

Calculated using mean annual runoff value of 142,700 AF, item 24, 1952 through 2002 . See remark #6

Annual computed nflowa by water year, from 1955 througn 2002.

8 Surface area & capaco ty at elevation 4,788.t, top of acti ve conservati on.

Annual computed nflowa by water year, fror, 1955 tnroug2 2002 ,Avalle records . Maxinur, nd minirnur

elevat ions from avaol able Reclamation records by water year.

2002 survey assume no change from elevaton 4,788 and above s:nce 198 3 survey. Storage d,zferer.c e from

previous surveys due to accuracy differences of surveys. Due to upst ream laker toe loss due to setiment

onflow from basin s reduced.

CapacIt ies computed by Reclaoation's ACAP computer progra m.

48. AGENCY MAKING SURVEY Eureau of Reclamation

49. AGENCY SUPPYING LATh Bureau of Rec..arnat..on DATE Septerrr 200'

Table 1. Reservoir sedimert data summary (page 2 of 2)

11
1 2 3 4 5 6 - 7 8 9 10 11 12 13 14

Area Volume Area Volume

Diff. Diff. Diff. 01ff.

Elev 1948 1948 1972 1972 1983 1983 2002 - 2002 1983- 1983- 1948- 1948-

Area Cap. Area Cap. Area Cap. Area Cap. 2002 2002 2002 2002 4

Feet Ac-Ft Acre Ac Acre Ac-Ft cx Ac-Ft flotth

4,8:0 2,163 :20,679 2,163 108,980 0 1,699 200.0

4,803 1,730 92,438 2,028 96,320 2,028 94,310 0 1,703 92.4

4,800 1,693 87,369 ,972 90,02 1,970 88,3:3 0 2,699 85.1

4,795 2655 79,000 i,87 80,414 .,871 78,7 C 1,703 83.7

4,793 3.860 75,435 1,639 75,706 1,827 76,707 1,827 75,012 0 :695 33 423 82.8

4,790 1,770 69,990 1,617 70,822 3,762 71,334 1,762 69628 0 1,706 8 362 78.'

4,788 1,730 66,490 1,60 67,604 1,718 67,854 1,719 66,147 -1 1,707 11 343 76.1

4,786 1,703 63,060 1,586 64,417 1,649 64,483 1,682 62,745 -33 1,738 18 315 73.9

4,782 1,610 56,430 1,536 58,161 1,535 58.162 1,600 56,176 -65 1,986 10 254 69.6

4,780 1,560 53,260 1,500 55,225 1,506 55,130 1,556 53,020 -50 2,110 4 240 67.4

4,778 1,510 50,190 1,464 52,160 1,466 52,158 1,513 49,952 -47 2,206 -3 238 65.2

4,776 1,460 47,220 1,428 49,267 3,427 49,265 1,463 46,976 36 2,289 -3 244 63.0

4,772 1,340 41,600 1,332 43,726 1,337 43,727 1,348 41,348 -11 2,379 -8 252 58.7

4,770 1,280 38,980 1,270 4.,124 1,268 41,122 1,264 38,736 4 2,386 16 244 56.5

-

4,768 1,230 36,470 1,212 38,651 1,214 38,650 1,224 36,248 -10 - 2,402 6 222 54.3

4,766 1,180 34,060 1,186 36,252 1,186 36,250 1,191 33,833 -5 2,417 -II 227 52.2

4,762 1,3.20 29,460 1,134 31,612 1,136 32,63.3 1,127 29,197 9 2,416 -7 263 47.8

-

4,760 1,100 27,240 1,108 29,371 1,107 29,369 1,097 26,973 10 2,396 3 267 45.7

4,758 1,070 25,070 1,081 27,182 1,079 27,183 1,063 24,812 16 2,371 7 258 43.5

4,756 1,040 22,960 1,049 25,052 1,050 25,054 1,031 22,719 20 2,335 - 10 241 41.3

4,752 970 28,950 984 20,987 984 20,986 958 18,742 26 2,244 12 208 37.0

4,750 930 17,050 952 19,051 952 19,051 926 16,858 26 2,193 4 192 34.8

4,748 890 15,230 922 17,178 924 17,179 893 15,040 31 2,139 3 190 32.6

4,746 860 13,480 890 15,365 891 15,365 856 13,291 35 2,074 4 189 - 30.4

4,742 790 10,190 819 11,935 820 11,935 779 10,015 41 1,920 11 175 26.1

4,740 750 8,650 786 10,330 785 10,330 742 8,494 43 1,836 8 156 23.9

4,738 720 7,180 752 8,793 756 8,795 707 7,046 49 1,749 13 134 21.7

4,736 690 5,770 716 7,323 715 7,324 661 5,678 54 1,646 29 92 19.6

4,732 610 3,150 622 4,634 624 4,635 545 3,249 79 1,386 65 -99 15.2

-

4,730 530 2,010 565 3,447 563 3,448 481 2,223 83 1,225 50 -213 13.0

4,729.3 492 1,652 542 3,061 541 3,061 444 1,899 97 1,162 48 -247 12.3

4,728 420 1,060 492 2,390 491 2,389 378 1,365 113 1,024 42 -305 10.9

4,726 320 320 393 1,506 390 1,506 258 729 132 777 62 -409 8.7

-

4,722 0 0 181 374 179 374 75 75 104 299 -75 -75 4.3

4,720 0 0 96 88, 105 87 0 0 105 87 - 0 0 -

2.2

4,718 0 0 0 0 0 0 0 0 0 0 0 - 0 3.0

1 Elevation of reservoir water surface.

2 1948 reservoir surface area.

3 1948 calculated reservoir capacity.

4 1972 reservoir surface area.

5 1972 calculated reservoir capacity.

6 1983 reservoir surface area. - -

7 1983 calculated reservoir capacity.

8 2002 reservoir surface area.

9 2002 calculated reservoir capacity computed using ACAP from original measured surface areas.

10 1983 through 2002 area difference co1 (6) - coli (8).

11 1983 through 2002 volume difference = col (7) - column (9).

12 1948 through 2002 area difference = column (2) - column (8).

13 1948 through 2002 volume difference co1t (3) - column (9).

14 Depth of reservoir expressed in percentage of total depth (92), below spillway crest.

Table 2.- Summary of 2002 survey results. 12
N

W+E

S

(J1

C

C

16 95000

(0

Cl

0

0

0

16 80000

C

C

C

C

C

0

16 95000

Rorizontal datum based on Montanas

state plane coordinate system in

North American Datum of 1983

Vertical datum based on original project

datum established by U.S. Bureau of

Reclamation that is 13.75 feet lower than

the North American Vertical Datum of 1988

0

C

0

0

C

C

16 80000

13

Lake Sherburne

Figure 2. - Lake Sherbume topographic map.
2,300

4,810

4,800

4,790

4,780

4,770

C

0

Cu

>S

..! 4,760

w

c/k

4,750

4,740

4,730

17'

VII

4,720 f

4,710

0

460 230 0

- 4,810 -1

-

- I

5-

5-

-

4,800 \

S -

5- \ -

S -

-5

5-

S S -

4,790 -.5

-5 .5' "S .5- '5s s..,.\ I 5, 5-- '-55S 55_S I

I

-

4,780

- T

- 1

-5

-5- 4,770

-5- 5 .5_S

5--

/

Capacity

/

S

4,760 /

/

/

/

/

/

+4,750

/

/

/1

'5,, Area -

/

/

'5'' 4,740

'.5

____2002

1972

--1983 4,730

1948 - -S__S

i T- -TI . 4,720

4,710

11100 22200 33300 44400 55500 66600 77700 88800 99900 111000

Capacity (acre-feet)

Figure 3. - 2002 area and capacity curves.

Area-Capacity Curves for Lake Sherburne

Area (acre)

2,070 1,840 1,610 1,380 1,150 920 690