Technical Report No. SRH-2009-9 

Lake Arrowhead 

2008 Reservoir Survey 

U.S. Department of the Interior 

Bureau of Reclamation 

Technical Service Center 

Denver, Colorado March 2009 
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1. REPORT DATE (DD-MM-YYYY) 

 March 2009 

2. REPORT TYPE 3. DATES COVERED (From – To) 

5a. CONTRACT NUMBER 

5b. GRANT NUMBER 

4. TITLE AND SUBTITLE 

Lake Arrowhead 

2008 Reservoir Survey 

5c. PROGRAM ELEMENT NUMBER 

5d. PROJECT NUMBER 

5e. TASK NUMBER 

6. AUTHOR(S) 

Ronald L. Ferrari 

5f. WORK UNIT NUMBER 

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

Bureau of Reclamation, Technical Service Center, Denver, CO 80225 

8. PERFORMING ORGANIZATION REPORT 

NUMBER 

9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S) 

Bureau of Reclamation, Denver Federal Center, PO Box 25007 

Denver, CO 80225-0007 11. SPONSOR/MONITOR'S REPORT 

NUMBER(S) 

12. DISTRIBUTION/AVAILABILITY STATEMENT 

13. SUPPLEMENTARY NOTES 

14. ABSTRACT 

Reclamation surveyed Lake Arrowhead in September 2008 to develop updated reservoir topography and compute the present 

storage-elevation relationship (area-capacity tables). The underwater survey was conducted near water surface elevation 5,103.7 

feet (ALA project datum). For this study, elevations are referenced to the ALA vertical datum, unless otherwise noted. The 

ALA vertical datum was computed to be 8.0 feet less than the National Geodetic Vertical Datum of 1929 (NGVD29) and 11.2 

feet less than the North American Vertical Datum of 1988 (NAVD88). The underwater survey used sonic depth recording 

equipment interfaced with a real-time kinematic (RTK) global positioning system (GPS) that provided continuous sounding 

positions throughout the underwater portion of the reservoir covered by the survey vessel. Shallow water shoreline collection 

was severely limited by occupied boat slips lining the reservoir perimeter. Collection of shoreline data was also limited by thick 

bottom vegetation that existed throughout the reservoir in depths around fifteen feet and less. The reservoir topography was 

mapped by merging the above water data with a digital water surface image obtained from 2005 aerial photography flown at 

reservoir elevation 5,107.0 feet (ALA project datum). 

As of September 2008, at reservoir water surface elevation 5,106.7 feet, the surface area was 767 acres with a total capacity of 

46,855 acre-feet. Elevation 5,106.7 is considered the spillway crest or full reservoir elevation.

15. SUBJECT TERMS 

reservoir area and capacity/ sedimentation/ reservoir surveys/ global positioning system/ sounders/ contour 

area/ RTK GPS/ 

16. SECURITY CLASSIFICATION OF: 19a. NAME OF RESPONSIBLE PERSON 

a. REPORT b. ABSTRACT a. THIS PAGE 

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OF ABSTRACT

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Standard Form 298 (Rev. 8/98) 

Prescribed by ANSI Std. Z39.18 
U.S. Department of the Interior 

Bureau of Reclamation 

Technical Service Center 

Water and Environmental Resources Division 

Sedimentation and River Hydraulics Group 

Denver, Colorado March 2009 

Technical Report No. SRH-2009-9 

Lake Arrowhead 

2008 Reservoir Survey 

prepared by 

Ronald L. Ferrari 
ACKNOWLEDGMENTS

The Bureau of Reclamation's (Reclamation) Sedimentation and River Hydraulics 

(Sedimentation) Group of the Technical Service Center (TSC) prepared and published 

this report. Kent Collins, Ronald Ferrari, and Mike Sixta of the Sedimentation Group 

conducted the bathymetry survey of the reservoir in September of 2008. Greg Krzys of 

Reclamation’s Southern California Area Office of the Mid-Pacific Region was the study 

coordinator. Ryan Gross, district engineer, and Mark Veysey, water resources planner, of 

the Lake Arrowhead Community Service District (LACSD) provided support throughout 

the planning, collection, and processing of the data for this report. Jim Grant, Lake 

Manager of the Arrowhead Lake Association (ALA), and his staff also provided valuable 

assistance throughout this study. Ron Ferrari completed the data processing to generate 

updated surface areas, new reservoir topography, and the resulting area-capacity tables 

enclosed within this report. Kent Collins performed the TSC technical peer review of 

this documentation. 

Mission Statements 

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. 

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. 

Reclamation Report 

This report was produced by the Bureau of Reclamation’s Sedimentation and 

River Hydraulics Group (Mail Code 86-68240), PO Box 25007, Denver, 

Colorado 80225-0007, www.usbr.gov/pmts/sediment/. 

Cover photo provided by LACSD.

Disclaimer 

No warranty is expressed or implied regarding the usefulness or completeness of 

the information contained in this report. References to commercial products do 

not imply endorsement by the Bureau of Reclamation and may not be used for 

advertising or promotional purposes. 
BUREAU OF RECLAMATION

Technical Service Center, Denver, Colorado

Sedimentation and River Hydraulics Group, 86-68240

Technical Report No. SRH-2009-9

Lake Arrowhead

2008 Reservoir Survey

Lake Arrowhead Dam

Lake Arrowhead, California

d:RonaIdL.Ferrri Dafe

Hydraulic Engineer, Sedimentation and River Hydraulics Group 86-68240

Peer Review: Kent L. Collins Date

Hydraulic Engineer, Sedimentation and River Hydraulics Group 86-68240
This page intentional left blank 
Table of Contents 

Page 

Introduction.........................................................................................................................1 

Summary and Conclusions .................................................................................................2 

Control Survey Data Information .......................................................................................5 

Hydrographic Survey Equipment and Method ...................................................................6 

Reservoir Area and Capacity ............................................................................................11 

Topography Development..........................................................................................11 

Reservoir Area and Capacity ............................................................................................17 

2008 Storage Capacity................................................................................................17 

References.........................................................................................................................25

Appendix...........................................................................................................................27 

Index of Figures 

Page 

Figure 1 - Lake Arrowhead Location Map (LACSD map).................................................1 

Figure 2 - Lake Arrowhead Spillway with reservoir spilling. ............................................2 

Figure 3 - Lake Arrowhead top of spillway structure looking towards reservoir...............3 

Figure 4 - ALA #7 control point located near the ALA marina..........................................6 

Figure 5 - Lake Arrowhead view of boat docks..................................................................7 

Figure 6 - Lake Arrowhead 2008 survey data points..........................................................9 

Figure 7 - Lake Arrowhead generated TIN.......................................................................13 

Figure 8 - Lake Arrowhead 2-foot contour map. ..............................................................15 

Figure 9 - Little Bear Creek Thalweg. ..............................................................................21 

Figure 10 - Lake Arrowhead Area and Capacity Plots. ....................................................23 

Index of Tables 

Page 

Table 1 - Lake Arrowhead Reservoir Data Summary. ......................................... 19 
This page intentional left blank 
Lake Arrowhead 

2008 Reservoir Survey

Introduction 

Lake Arrowhead and its dam, located in the San Bernardino National Forest in 

San Bernardino County, are on Little Bear Creek about 30 miles northeast of 

Fontana and about 65 miles northeast of Los Angeles in southern California 

(Figure 1). Lake Arrowhead was formally known as Lake Little Bear with initial 

development in the 1890’s to provide a diverted water supply for the San 

Bernardino area. These diversions never materialized and the completed reservoir 

was renamed Lake Arrowhead, becoming a resort community. The recreational 

use of the reservoir is controlled by the Arrowhead Lake Association (ALA). The 

Lake Arrowhead Community Services District (LACSD) withdraws water from 

the reservoir for treatment and distribution to local residents for potable use. 

Figure 1 - Lake Arrowhead Location Map (LACSD). 

1
2

Lake Arrowhead Dam is a 200-foot earthen dam described as semi-hydraulic with 

a steel-reinforced cement core. The spillway is located on the north side of the 

reservoir and drains into Willow Creek, Figures 2 and 3. The original spillway 

overflow crest was at elevation 5,107.7 feet1

, but was modified in 1968 to crest 

elevation 5,106.7 (GEI Consultants, Inc, 2004). Prior to filling, the trees and 

bushes were cleared from Little Bear Valley for the new reservoir. The USGS 

gage at Willow Creek reports a Lake Arrowhead drainage area of 6.76 square 

miles that extends upstream from the reservoir to an elevation of around 6,000 

feet. 

Figure 2 - Lake Arrowhead Spillway with reservoir spilling (LACSD). 

Summary and Conclusions 

This Reclamation report presents the results of the September 2008 survey of 

Lake Arrowhead. The primary objectives of the survey were to gather data 

needed to: 

• compute area-capacity relationships 

• develop reservoir topography 

 

1

All elevations in this report are in feet. Unless noted, the elevations in this report are based on the Lake 

Arrowhead datum, established during construction, which is around 8.0 feet lower than NGVD29 and 11.2 

feet lower than NAVD88. 
Figure 3 – From Lake Arrowhead spillway structure looking towards reservoir, 9/2008, (LACSD). 

A control survey was conducted using the on-line positioning user service 

(OPUS) and RTK GPS to establish a horizontal and vertical control network near 

the reservoir for the bathymetric survey. OPUS is operated by the National 

Geodetic Survey (NGS) and allows users to submit GPS data files that are 

processed with known point data to determine positions relative to the national 

control network. The GPS base was set over a temporarily driven piece of rebar 

on a dirt mound located east of the dam and highway 173 between Lake 

Arrowhead and Papoose Lake. The coordinates for this point were processed 

using OPUS, and from this base the complete bathymetric survey was conducted. 

The OPUS generated coordinates were verified by RTK GPS observation shots on 

a previously established datum point “ALA #7” that is located above the boat 

ramp at the ALA marina on the northern end of the dam, Figure 4. 

The horizontal control was established in California state plane coordinates, zone 

5, on the North American Datum of 1983 (NAD83). The vertical control was tied 

to NAVD88 in feet. RTK GPS water surface measurements were compared to the 

reservoir water surface recorded by the ALA gage and found to be around 11.2 

feet higher. NGS published data in the study area shows the NAVD88 elevations 

are around 3.16 feet higher than NGVD29 elevations. Previous surveys 

determined the ALA datum to be around 8.0 feet lower than NGVD29. For this 

study, elevation differences were rounded off to the nearest tenth of a foot (0.1). 

3
4

The 2008 underwater survey, from September 3 through September 11, was 

conducted between reservoir elevation 5,103.7 and 5,103.8 or around three feet 

below spillway crest elevation 5,106.7. The water surface was measured by the 

ALA gage located near the dam along with RTK GPS water surface 

measurements throughout the 2008 survey. The bathymetric survey used sonic 

depth recording equipment interfaced with RTK GPS for determining the 

reservoir sounding locations that were navigated by the survey vessel. 

Extensive development around the reservoir limited access by the survey vessel 

along the shoreline, preventing complete coverage during the bathymetric 

collection effort. The reservoir has over 1,000 boat slips and most were occupied 

during the September 2008 collection. Time was taken to collect within and 

between the boat slips that allowed access by the survey vessel. The system 

continuously recorded depth and horizontal coordinates as the survey boat 

navigated along computer generated grid lines that covered much of the open 

areas of the underwater portion of reservoir. The positioning system provided 

information to allow the boat operator to maintain a course along these lines that 

were set at 100 foot increments. The water surface elevations recorded by the 

ALA’s reservoir gage and confirmed by RTK GPS measurements during the time 

of collection were used to convert the sonic depth measurements to true reservoir 

bottom elevations. Limited above and below water topography was obtained on 

foot using the RTK GPS system around some of the boat slip areas that hindered 

the bathymetric collection. These additional points were used during contour 

development and as a guide for interpolating additional points as needed to 

generate the shoreline topography. 

Standard surveying techniques were used to collect and develop a 2005 digital 

orthophoto of the Lake Arrowhead contour with the reservoir water surface at 

elevation 5,107.0. The water surface on the 2005 aerial photograph was digitized 

under an ALA contract. The 2005 developed contour at elevation 5,107.0 was 

used during the bathymetric collection where it was found that its features lined 

up with the established 2008 survey. The 5,107.0 digitized contour was also used 

for development of the 2008 reservoir topography and the resulting area-capacity 

values presented in this report. 

The 2008 Lake Arrowhead topography is a combination of the digitized 

orthophoto water surface at elevation 5,107.0, the 2008 bathymetric and RTK 

GPS measurements, and points interpolated along the shoreline to develop 

realistic contours where the shoreline data was limited. The 2008 area and 

capacity tables were produced from a computer program that used the measured 

surface areas from the 2008 developed topography and a curve-fitting technique 

to compute area and capacity at prescribed elevation increments (Bureau of 

Reclamation, 1985). 

Table 1 contains a summary of Lake Arrowhead and watershed characteristics for 

the 2008 survey. The 2008 survey determined that the reservoir has a total 
storage capacity of 46,855 acre-feet with a surface area of 767 acres at water 

surface elevation 5,106.7. 

Control Survey Data Information 

For the 2008 hydrographic survey of Lake Arrowhead a control survey was 

conducted using OPUS and RTK GPS to establish a horizontal and vertical 

control network near the reservoir. OPUS is operated by the National Geodetic 

Survey (NGS) and allows users to submit GPS data files that are processed with 

known point data to determine positions relative to the national control network. 

The RTK GPS base was set over a temporarily driven piece of rebar on a high 

bank that overlooked the reservoir and was located east of the dam between Lake 

Arrowhead and Papoose Lake. The coordinates for this point were processed for 

the 2008 survey days using OPUS, and from this base additional points were 

established and checked during the survey. The OPUS generated coordinates 

were further verified by RTK GPS observations on the ALA datum point number 

7, “ALA #7,” located near the ALA boat ramp and dam, Figure 4. This point was 

established by a detailed GPS field survey under the direction of Bradley L. Brier, 

Inc. in May of 2006. Their survey results were slightly adjusted to conform to a 

previously establish control network (pre-GPS). The September 2008 OPUS 

horizontal control was also slightly adjusted to conform to this pre-GPS survey 

and the 2008 elevations were adjusted to the ALA vertical datum. 

ALA #7 (California State Plane Coordinates, Zone 5, Feet)

North 1,918,954.78 (Bradley L. Brier control survey) 

East 6,813,205.66 (Bradley L. Brier control survey) 

 (NGVD29) Elevation 5,131.67 (Bradley L. Brier control survey) 

(NAVD88) Elevation 5,134.83 (BOR 9/2008 survey) 

(ALA datum) Elevation 5,123.6 (BOR 9/2008 survey) 

The horizontal control, in NAD83, was tied to the California zone 5 state plane 

coordinate system in feet and to the pre-GPS survey mentioned above. The 

vertical control, in feet, was tied to NAVD88, NGVD29 and the ALA vertical 

datum. Unless noted, all elevations in this report are referenced to the ALA 

vertical datum that for this study is around 8.02

 feet lower than NGVD29 and 

around 11.2 feet lower than NAVD88. 

 

2

For this study, all elevations were tied to the ALA datum and rounded off to the nearest tenth of a foot. 

5
6

Figure 4 - ALA #7 control point located near the ALA marina. 

Hydrographic Survey Equipment and 

Method 

The hydrographic survey equipment was mounted on an aluminum vessel with 

the transducer and GPS unit located on the bow, allowing shallow depth 

collection closer to the shoreline when the vessel was able to navigate between 

and around the numerous boat slips. Figure 5 provides an aerial view of the 

numerous boat slips in one portion of the reservoir. The photo was taken when 

only a few boats were present. During the September 2008 collection, the 

majority of these slips had boats docked within, thereby limiting the areas where 

the survey vessel was able to nose-in near the shore. 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. On-board batteries powered all the equipment. 

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

shore GPS receiver and antenna were mounted on survey tripods over a known 

datum point and powered by a 12-volt battery.
Figure 5 - Lake Arrowhead view of boat docks. 

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 RTK GPS system employs two receivers that track the 

same satellites simultaneously just like with differential GPS. The basic outputs 

from a RTK receiver are precise 3-D coordinates in latitude, longitude, and height 

with accuracies on the order of 2 centimeters horizontally and 3 centimeters 

vertically. The output is on the GPS WGS-84 datum that the hydrographic 

collection software converted into California’s state plane coordinates, zone 5, in 

NAD83. 

The Lake Arrowhead bathymetric survey was conducted from September 3 

through 11, 2008 between water surface elevation 5,103.7 and 5,103.8 (ALA 

datum). The bathymetric survey was conducted using sonic depth recording 

equipment, interfaced with a 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 along 

established grid lines throughout the reservoir. The survey vessel's guidance 

system provided directions to the boat operator to assist in maintaining a course 

along predetermined lines. 

As each line was traversed, the depth and position data were recorded on the 

laptop computer hard drive for subsequent processing. The water surface 

elevations at the dam, recorded by the ALA gage and RTK GPS measurements, 

were used to convert the sonic depth measurements to lake-bottom elevations. 

The elevations are all tied to ALA’s vertical datum that is around 8.0 feet lower 

than NGVD29 and 11.2 feet lower than NAVD88. All elevation shifts were 

rounded off to the nearest tenth of a foot for this analysis and report. 

There were coves and areas along the shoreline throughout the reservoir that were 

not covered by the survey vessel due to the numerous occupied boat slips, shallow 

7
8

water conditions and shoreline vegetation. Prior to the September 2008 

collection, the vegetation that existed around the shoreline was sprayed and had 

died off and settled on the reservoir bottom. This affected the depths where 

digital depth measurements were recorded on top of the dense vegetation. During 

processing, the areas where this occurred were adjusted to true reservoir bottom 

depths using the paper depth charts to distinguish between the vegetation and 

reservoir bottom. During survey along each line, the depth and position data were 

recorded on the laptop computer hard drive for this subsequent processing. Final 

processing of the 2008 September collected data resulted in around 116,000 

points (Figure 6). 

The 2008 underwater data was collected using a depth sounder that was calibrated 

by adjusting the speed of sound through the water column which can vary with 

density, salinity, temperature, turbidity, and other conditions. The measured 

depths were also checked by lowering a weighted, marked cable below the 

sounder’s transducer. The collected data were digitally transmitted to the 

computer collection system through a RS-232 port. The depth sounder also 

produced an analog hard-copy chart of the measured depths. These graphed 

analog charts were analyzed during post-processing, and when the analog charted 

depths indicated a difference from the computer recorded bottom depths, the 

computer data files were modified. Additional information on collection and 

analysis procedures are outlined in Chapter 9 of the Erosion and Sedimentation 

Manual (Ferrari and Collins, 2006). 

A very small portion of the upper elevations of the reservoir, not covered by the 

2008 boat survey, was surveyed on foot in September of 2008. Standard land 

surveying techniques, using RTK GPS, were used to measure topography along 

the shoreline including above and below water reservoir bottom areas. Shallow 

under water areas were surveyed by walking along the boat docks and lowering 

GPS units mounted on top of extended survey rods. Land surveys were 

performed in selected areas where survey vessel access was limited by occupied 

boat slips. Steep topography and thick vegetation in some areas prevented data 

collection by land due to satellite blockage. However, the land survey was 

primarily limited by the amount of time required for this collection technique and 

access issues. Many boat slips were not accessible by land due to locked gates. 

One means to collect additional data along the shoreline would be to conduct a 

bathymetric survey in early spring or fall when fewer boats are on the reservoir. 

Remaining boat docks would limit shoreline access even during these times 

however. Aerial survey during a period of very low reservoir content is the best 

method to map the shoreline, but that would still require interpolation beneath the 

boat slip structures. 

GPS water surface measurements were also collected on Papoose Lake, 

downstream of Lake Arrowhead Dam, in September 2008. The measurements 

determined that the water surface on Papoose Lake was four feet lower than Lake 

Arrowhead’s water surface. 
9
10

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Reservoir Area and Capacity 

Topography Development 

The topography of Lake Arrowhead was developed from the 2008 above and 

below water survey data and the digitized water surface from the 2005 aerial 

photography that was flown at reservoir water surface elevation 5,107.0. The 

digitized 5,107.0 water surface contour was used as a hard boundary for the 2008 

developed contours, allowing contours to only be developed within the reservoir 

area outlined by this hardclip contour. During the analysis, the 2008 collected 

data and aerial photography was used to aid in adding data points along the 

shoreline and in small coves around the reservoir where survey was limited by the 

numerous boat docks. Data interpolation was the only way to develop contours 

representing the true area at this time. Obtaining actual data in these areas would 

require additional collection by means such as aerial LiDAR (Light Detection and 

Ranging) with the lake level drawn down, bathymetric LiDAR when reservoir 

water is as clear as possible, additional land collection using a total station, and/or 

additional bathymetric collection when reservoir is near full and when limited 

vessels are on the water. The numerous boat slips and underwater vegetation 

would hinder data collection for all these methods. 

The digitized water surface contour, elevation 5,107.0, was used to perform the 

hardclip around the survey data points from elevation 5,107.0 and below within 

Lake Arrowhead. The hardclip was used during the triangular irregular network 

(TIN) development to prevent interpolation outside the enclosed polygon. The 

5,107.0 contour was selected for the hardclip boundary since it was the closest 

data available to represent the water surface during the 2008 underwater survey. 

Limited RTK GPS ground data collected above and below elevation 5,107.0 was 

used to better confirm the digitized contour and also used as a guide to interpolate 

additional points as needed for development of reliable contours along the 

shoreline. 

Other available shoreline data included the 2002 contours around Lake 

Arrowhead. Detailed information on how these contours were developed was 

limited. During this analysis, the 2002 data set was superimposed with all other 

available data with mixed results. Due to the uncertainties it was decided for the 

2008 analysis to not include the 2002 data. 

Contours for the reservoir below elevation 5,107.0 were developed from the TIN 

generated within ARCGIS, Figure 7. A TIN is a set of adjacent non-overlapping 

triangles computed from irregularly spaced points with x,y coordinates and z 

values. A TIN is designed to deal with continuous data such as elevations. The 

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

11
12

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 each data point is connected to its two nearest neighbors 

to form triangles. This method preserves all the collected data points. The TIN 

method is discussed in detail in the ARCGIS user’s documentation, (ESRI, 2007). 

The linear interpolation option of the ARCGIS TIN and CONTOUR commands 

was used to interpolate contours from the Lake Arrowhead TIN. The areas of the 

enclosed contour polygons at one-foot increments were computed from the survey 

data for elevations 4,955.0 through 5,107.0. The surface area of the digitized 

orthophoto water surface contour, elevation 5,107.0, minus the island area, was 

used for the 2008 area and capacity computations. The reservoir contour 

topography at 2-foot intervals from elevation 5,106 and below is presented on 

Figure 8. The outer contour is the digitized elevation 5,107.0 water surface. First 

development of the contours within ARCGIS was directly from the created TIN 

using all the enclosed data points and resulted in a somewhat jagged 

representation of the contours. Using the smooth line options within ARCMAP, 

the initial contours were somewhat smoothed and are presented on Figure 8. 

The steepness of the reservoir bottom shown on Figures 7 and 8 is further 

illustrated on a plot of the Little Bear Creek thalweg alignment as it runs from the 

upper reservoir towards the dam, Figure 9. The plot shows the reservoir bottom 

elevation dropping over 150 feet from the upper reservoir to the dam, a distance 

of less than 3.5 miles. 
13
14

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15
16

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Reservoir Area and Capacity 

2008 Storage Capacity 

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

developed using the area-capacity computer program ACAP (Bureau of 

Reclamation, 1985). The ACAP program can compute the area and capacity at 

elevation increments from 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 within an 

allowable error limit. The error limit was set at 0.000001 for Lake Arrowhead. 

The capacity equation is then used over the full range of intervals fitting within 

the allowable error limit. For the first interval at which the initial allowable error 

limit is exceeded, a new capacity equation (integrated from the 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. 

Through differentiation of the capacity equations, which are of second order 

polynomial form, final area equations are derived: 

y = a1 + a2x + a3x

2 

 where: y = capacity 

x = elevation above a reference base 

a1 = intercept 

a2 and a3 = coefficients 

Results of the Lake Arrowhead area and capacity computations are listed in the 

appendix for 0.1-foot elevation increments (Bureau of Reclamation, 2008). A 

description of the computations and coefficients output from the ACAP program 

is included with these tables. The results are also listed on table 1 and illustrated 

on the area and capacity plot, Figure 10. As of September 2008, at elevation 

5,106.7, the surface area was 767 acres with a total capacity of 46,855 acre-feet. 

17
18

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1. 2. 3. STATE California

4. 5. Lake Arrowhead 6. COUNTY

7. ° 15 ' 41 " ° 10 ' 03 " 8. 2 9. SPILLWAY CREST EL 3

10. 11. 12. GROSS STORAGE 15

CAPACITY, AC-FT

a. 3

b.

c.

d. 16

e.

f.

g.

17. LENGTH OF RESERVOIR 4

18. TOTAL DRAINAGE AREA 5 22.

19. NET SEDIMENT CONTRIBUTING AREA 23. MEAN ANNUAL RUNOFF

20. LENGTH MILES AVG. WIDTH MILES 24. MEAN ANNUAL INFLOW

21. 25. °F °F

26. DATE OF 27. 28. 29. 30. 31. C/

26. DATE OF 35. 36

26. DATE OF 37. 38.

26. DATE OF 39.AVG. DRY WT. 40. SED. DEP. TONS/MI.2

-YR 41. STORAGE LOSS, PCT. 42 SEDIMENT 

(#/FT3

) b. TOTAL b. TOTAL TO INFLOW, PPM

TO DATE DATE a. PER. b. TOT.

43.

San Bernardino

2008

SURFACE

DATE

STORAGE

5,116

14.

2-ft 9 767

ANNUAL TEMP, MEAN °F RANGE

5,106.7

ACRE-FEET

NAME OF RESERVOIR 1

DATA SHEET NO.

RESERVOIR SEDIMENT

DATA SUMMARY

Lake Arrowhead Reservoir

SURVEY

26. 44. REACH DESIGNATION PERCENT OF TOTAL ORIGINAL LENGTH OF RESERVOIR

Y

D

b.

A

T

YRS

WATER INFLOW TO DATE, AF

SURVEY

PERIOD CAPACITY LOSS, ACRE-FEET

TOTAL

SURVEY

SURVEY

CAPACITY

V

R

S AREA, AC.

U

PER.

 

b.

34. PERIOD

a. TOTAL

 

 /MI.2

-YR.

b. MAX. ANN.

PERIOD WATER INFLOW, ACRE-FEET

MEAN ANN.

to

BEGAN

BEGAN

DATE NORMAL

33.

OPERATIONS

1921

INCHES

INCHES

MAX. ELEVATION

SQUARE MILES

MIN. ELEVATION

46,855

32.

ACRE - FEET

767 46,855

R

E

2008

SURFACE AREA, AC

R

E

S

R

V

O

N 6,000+

I INACTIVE

DEAD

TOP OF DAM ELEVATION

0.27

S

A

B MEAN ANNUAL PRECIPITATION

I

46,855

6.76

AVG. WIDTH OF RESERVOIR

5106.7

RANGE 3W

STREAM Little Bear Creek

14 TWP. 2N

OWNER

M 34

D ALA and LACSD1 

A

LONG

SEC

SURCHARGE

5,106.7

ALLOCATION TOP OF POOL

FLOOD CONTROL

LAT

MILES

40

JOINT USE

CONSERVATION

117

STORAGE

ACRE-FEET

RATIO AF/AF

AVG. ANN. c.

c. TOTAL a. 

9/2008

 

 

DEPTH DESIGNATION RANGE IN FEET BELOW AND ABOVE CREST ELEVATION

90-100

9/2008

26.

DATE

OF

DATE

 60-50 30-20 10-C

 

20-10 C-5

40-50 50-60 80-90

 

0-10 10-20 20-30 30-40 60-70 70-80 110-

ELEVATION

6.76

4.5

SQUARE MILES

13.

IRRIGATION

ANNUAL

SURVEY

MILES

PRECIPITATION

Contour (D)

SURVEY

a.

PER.

YRS

9/2008

TYPE OF NO. OF

RANGES OR 

INTERVALS

105- 115- 120-

50-40 40-30

E 12.6

A 9/2008

 

TOTAL SEDIMENT DEPOSITS TO DATE, AF

MEAN ANN. b. TOTAL

 

 /MI.2

-YR.

 

a. PERIOD

 

a. AVG. ANNUAL

a.

NEAREST P.O.

 

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN DEPTH DESIGNATION

 

PERCENT OF TOTAL SEDIMENT LOCATED WITHIN REACH DESIGNATION

 

 

1913

AVG. ANN. c.

Table 1 - Lake Arrowhead Reservoir Data Summary (1 of 2). 

19
20

1

 withdraws water for local potable use.

2

3

4

5

10,882

5,034.0 8,963

5,038.0 325.0 10,221

39,064

43,338

46,855

5,036.0

5,042.0 345.7 11,563

9,582

27,701

31,233

35,028

397.5

431.1

468.9

509.6

304.3

335.5

365.6

5,040.0

5,032.0 293.6 8,365

585 4,984.0 56.8 694 4,986.0 60.6 812

2008

5

ELEVATION AREA CAPACITY 1 SURVEY

77.9

21.2

38.1

52.6

4,976.0

4,970.0

4,982.0

768.8

5,026.0

5,012.0 184.6

5,006.0 144.2

215.6

260.5

47. REMARKS AND REFERENCES

 measured surface area at elevation 5,106.7 divided by the total length of the reservoir.

USGS Willow Creek gage at Lake Arrowhead. 

Arrowhead Lake Association (ALA) maintains the reservoir recreational use and Lake Arrowhead Community Service District (LACSD)

 Dam crest elevation around 5,116 feet. Measured on road during 2008 RTK GPS survey. All elevations are in feet and tied to the ALA 

 Total length of the summation of the distance from the dam to the upper elevation of Little Bear Creek plus the distance from the confluence

49. Bureau of Reclamation January 2009

AGENCY MAKING SURVEY

AGENCY SUPPLYING DATA DATE

4,958.0

4,994.0

5,000.0

5,018.0

5,107.00

YEAR MAX. ELEV.

48. Bureau of Reclamation

 vertical datum. The ALA datum is around 8.0 feet lower than NGVD29 and 11.2 feet lower than NAVD88. 

 2008 survey results.

 of North Bay and Little Bear Creek upstream to the upper elevation of the North Bay. The average width of the reservoir is the 

MIN. ELEV. INFLOW, AF YEAR MAX. ELEV. MIN. ELEV. INFLOW, AF

1,365

1,883

4,799

6,702

3,598

2,605

133

4,956.0 0.8 0

ELEVATION AREA

46. ELEVATION - AREA - CAPACITY - DATA FOR

181

4,955.0 0.0 0

 CAPACITY

111.6 2,093

195.1 3,978

159.2

5,241

7,234

4,960.0 5.5 13 4,962.0 7.5 26

4,998.0 88.5 1,525

241

484

1,213

96

2,333

5,024.0 249.3 6,193

5,004.0 128.2

4,378

CAPACITY ELEVATION AREA CAPACITY

5,028.0 271.6

5,002.0

7,789

 

5,030.0 282.7

314.4

4,996.0 82.5 324

 

5,020.0 226.5

45. RANGE IN RESERVOIR OPERATION

98.4

3.3

47,085

4,972.0 26.8 4,974.0 32.7

311 4,978.0 43.3 393 4,980.0 48.1

4,988.0 64.6 937 4,990.0 69.1 1,071 4,992.0 73.5

4,964.0 10.2 44 4,966.0 12.6 67 4,968.0 16.2

5,014.0

5,008.0 2,908 5,010.0 173.1 3,241

5,016.0 205.2

5,044.0 355.6 12,264 5,046.0 12,985 5,048.0 376.2 13,727

5,050.0 386.8 14,490 5,052.0 15,274 5,054.0 408.3 16,080

5,056.0 419.8 16,908 5,058.0 17,759 5,060.0 442.9 18,633

5,062.0 455.3 19,531 5,064.0 20,456 5,066.0 482.7 21,407

5,068.0 496.2 22,386 5,070.0 23,392 5,072.0 524.4 24,426

5,074.0 539.0 25,489 5,076.0 552.8 26,581 5,078.0 566.9

5,080.0 581.3 28,849 5,082.0 595.9 30,026 5,084.0 611.0

5,086.0 624.6 32,469 5,088.0 640.3 33,734 5,090.0 654.0

5,092.0 666.3 36,348 5,094.0 678.5 37,693 5,096.0 692.8

5,098.0 706.1 40,463 5,100.0 718.6 41,888 5,102.0 731.6

5,104.0 744.8 44,814 5,106.0 761.0 46,320 5,106.7 767.0

. 

Table 1 – Lake Arrowhead Reservoir Data Summary (2 of 2).
21

2008 Little Bear Creek Profile

49504960497049804990500050105020503050405050506050705080509051005110

18000 17000 16000 15000 14000 13000 12000 11000 10000 9000 8000 7000 6000 5000 4000 

Distance Upstream of Dam (miles)

________ Little Bear Creek

Figure 9 - Little Bear Creek Thalweg. 
22

This page intentionally left blank. 
2008 Area-Capacity Curves for Lake Arrowhead

4,9504,9604,9704,9804,9905,0005,0105,0205,0305,0405,0505,0605,0705,0805,0905,1005,110

0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 

Capacity (acre-feet)

Elevation (ALA datum in feet)

800 720 640 560 480 400 320 240 160 

Area (acres)

Capacity 

23

Figure 10 - Lake Arrowhead Area and Capacity Plots. 
24

This page intentionally left blank. 
References 

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

New York. 

Bradley L. Brier, Inc., May 2006. Lake Arrowhead Mapping Control of May 2006, Lake 

Arrowhead, CA. brad@briersurveying.com. 

Bureau of Reclamation, 1985. Surface Water Branch, ACAP85 User's Manual, Technical 

Service Center, Denver CO. 

Bureau of Reclamation, 1987(a). Guide for Preparation of Standing 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, 2008. Project Data, Denver Office, Denver CO. 

(www.usbr.gov/dataweb). 

Corps of Engineers, 2002. Engineering and Design Hydrographic Surveying, EM 1110-2-1003, 

Department of the Army, Washington DC, 

(www.usace.army.mil/inet/usace-docs/eng-manuals/em1110-2-1003/toc.htm). 

ESRI, 2006. Environmental Systems Research Institute, Inc. (www.esri.com) 

Ferrari, R.L. and Collins, K. (2006). Reservoir Survey and Data Analysis, Chapter 9, Erosion 

and Sedimentation Manual, U.S. Department of the Interior, Bureau of Reclamation, Technical 

Service Center, Sedimentation and River Hydraulics Group. Denver, Colorado. 

www.usbr.gov/pmts/sediment

GEI Consultants, Inc, 2004. Lake Level Analysis Lake Arrowhead, California, BookmanEdmonston, Division of GEI Consultants, Inc. Glendale, CA. 

25
26
27

Appendix 
28
29

Lake Arrowhead 

California 

 

Area and Capacity Tables 
30

The tables for Lake Arrowhead were generated by means of the area-capacity program ACAP, using the 

least squares method of curve fitting developed by the Bureau of Reclamation Technical Service 

Center. This program computes area at 1.0-, 0.1-, and 0.01-foot increments by linear interpolation 

between basic data contours. The respective capacities and capacity equations are than obtained by 

integration of the area equations. The initial capacity equation is tested over successive intervals 

to check whether it fits within an allowable error term. At the next interval beyond, a new capacity 

equation (integrated from the basic area equation over that interval) begins testing the fit until it 

too exceeds the error term. The capacity curve thus becomes a series of curves, each fitting a 

certain region of data. The final area equations are obtained by differentiation of the capacity 

equations. Capacity equations are of the form y = a1 + a2x +a3x2

 where y is capacity and x is the 

elevation above an elevation base. The capacity equation coefficients for the reservoir are shown 

below (ε = 0.000001). 

LAKE ARROWHEAD - CALIFORNIA 

2008 AREA-CAPACITY TABLES 

 

 EQUATION ELEVATION CAPACITY COEFFICIENT COEFFICIENT COEFFICIENT 

 NUMBER BASE BASE A1(INTERCEPT) A2(1ST TERM ) A3(2ND TERM )

 1 4955.00 0 .0000 .0000 .4000 

 2 4956.00 0 .4000 .8000 .6250 

 3 4958.00 4 4.5000 3.3000 .5500 

 4 4960.00 13 13.3000 5.5000 .5000 

 5 4962.00 26 26.3000 7.5000 .6750 

 6 4964.00 44 44.0000 10.2000 .6000 

 7 4966.00 66 66.8000 12.6000 .9000 

 8 4968.00 95 95.6000 16.2000 1.2500 

 9 4970.00 133 133.0000 21.2000 1.4000 

 10 4972.00 181 181.0000 26.8000 1.4750 

 11 4974.00 240 240.5000 32.7000 1.3500 

 12 4976.00 311 311.3000 38.1000 1.3000 

 13 4978.00 392 392.7000 43.3000 1.2000 

 14 4980.00 484 484.1000 48.1000 1.1250 

 15 4982.00 584 584.8000 52.6000 1.0500 

 16 4984.00 694 694.2000 56.8000 .9500 

 17 4986.00 811 811.6000 60.6000 1.0000 

 18 4988.00 936 936.8001 64.6000 1.1250 

 19 4990.00 1070 1070.5000 69.1000 1.1000 

 20 4994.00 1364 1364.5000 77.9000 1.1500 

 21 4996.00 1524 1524.9000 82.5000 1.5000 

 22 4998.00 1695 1695.9000 88.5000 2.4750 

 23 5000.00 1882 1882.8001 98.4000 3.3000 

 24 5002.00 2092 2092.8000 111.6001 4.1500 

 25 5004.00 2332 2332.6001 128.2001 3.9999 

 26 5006.00 2605 2605.0000 144.2000 3.7500 

 27 5008.00 2908 2908.4000 159.1999 3.4750 

 28 5010.00 3240 3240.7000 173.1000 2.8750 

 29 5012.00 3598 3598.3999 184.6002 2.6249 

 30 5014.00 3978 3978.0999 195.1000 2.5250 

 31 5016.00 4378 4378.3999 205.2001 2.5999 

 32 5018.00 4799 4799.1997 215.5999 2.7250 

 33 5020.00 5241 5241.2999 226.4998 2.8001 

 34 5022.00 5705 5705.4999 237.7003 2.8999 

 35 5024.00 6192 6192.5000 249.3000 2.8000 

 36 5026.00 6702 6702.2997 260.5002 2.7750 

 37 5030.00 7788 7788.6998 282.6997 2.7252 

 38 5032.00 8365 8365.0000 293.6000 2.6751 

 39 5034.00 8962 8962.9005 304.2997 2.5251 

 40 5036.00 9581 9581.6007 314.3995 2.6503 

 41 5038.00 10221 10221.0011 325.0000 2.6250 

 42 5040.00 10881 10881.5010 335.5004 2.5498 

 43 5042.00 11562 11562.7011 345.7000 2.4750 

 44 5044.00 12264 12264.0009 355.6000 2.5001 

 45 5046.00 12985 12985.2014 365.5998 2.6500 

 46 5050.00 14490 14490.0125 386.7692 2.6875 

 47 5054.00 16080 16080.1008 408.2993 2.8754 

 48 5056.00 16908 16908.2006 419.8001 2.8252 

 49 5058.00 17759 17759.1013 431.1005 2.9498 

 50 5060.00 18633 18633.1009 442.9014 3.0994 

 
31

EQUATION ELEVATION CAPACITY COEFFICIENT COEFFICIENT COEFFICIENT 

 NUMBER BASE BASE A1(INTERCEPT) A2(1ST TERM ) A3(2ND TERM )

 51 5062.00 19531 19531.3009 455.2999 3.4000 

 52 5064.00 20455 20455.4996 468.9009 3.4496 

 53 5066.00 21407 21407.0880 482.7309 3.3625 

 54 5070.00 23391 23391.7776 509.6614 3.6751 

 55 5074.00 25489 25489.2010 538.9998 3.4503 

 56 5076.00 26581 26581.0019 552.8002 3.5248 

 57 5078.00 27700 27700.7245 566.8383 3.6249 

 58 5082.00 30026 30026.0994 595.9005 3.7748 

 59 5084.00 31233 31232.9998 611.0008 3.3996 

 60 5086.00 32468 32468.5995 624.6014 3.9243 

 61 5088.00 33733 33733.4991 640.3020 3.4243 

 62 5090.00 35027 35027.7888 654.0317 3.0623 

 63 5094.00 37692 37692.9030 678.4994 3.5751 

 64 5096.00 39064 39064.2029 692.8007 3.3246 

 65 5098.00 40463 40463.1009 706.1009 3.1247 

 66 5100.00 41887 41887.8237 718.5388 3.2748 

 67 5104.00 44814 44814.3771 744.8690 4.0171 

 68 5107.00 47085 47085.0978 768.7997 13.2007 

 
32
 LAKE ARROWHEAD - CALIFORNIA (A

 2008 AREA-CAPACITY TABLES  THE AREA TABLE IS IN ACRES THE ELEVATION INCREMENT IS IN ONE TENTH  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  4955 0. 0. 0. 0. 0. 0. 0. 1.  4956 1. 1. 1. 1. 1. 1. 2. 2.  4957 2. 2. 2. 2. 3. 3. 3. 3.  4958 3. 3. 4. 4. 4. 4. 4. 4.  4959 4. 5. 5. 5. 5. 5. 5. 5.  4960 6. 6. 6. 6. 6. 6. 6. 6.  4961 7. 7. 7. 7. 7. 7. 7. 7.  4962 7. 8. 8. 8. 8. 8. 8. 8.  4963 9. 9. 9. 9. 9. 10. 10. 10.  4964 10. 10. 10. 11. 11. 11. 11. 11.  4965 11. 12. 12. 12. 12. 12. 12. 12.  4966 13. 13. 13. 13. 13. 14. 14. 14.  4967 14. 15. 15. 15. 15. 15. 15. 16.  4968 16. 16. 17. 17. 17. 17. 18. 18.  4969 19. 19. 19. 19. 20. 20. 20. 20.  4970 21. 21. 22. 22. 22. 23. 23. 23.  4971 24. 24. 25. 25. 25. 25. 26. 26.  4972 27. 27. 27. 28. 28. 28. 29. 29.  4973 30. 30. 30. 31. 31. 31. 32. 32.  4974 33. 33. 33. 34. 34. 34. 34. 35.  4975 35. 36. 36. 36. 36. 37. 37. 37.  4976 38. 38. 39. 39. 39. 39. 40. 40.  4977 41. 41. 41. 41. 42. 42. 42. 43.  4978 43. 44. 44. 44. 44. 44. 45. 45.  4979 46. 46. 46. 46. 47. 47. 47. 47.  4980 48. 48. 49. 49. 49. 49. 49. 50.  4981 50. 51. 51. 51. 51. 51. 52. 52.  4982 53. 53. 53. 53. 53. 54. 54. 54.  4983 55. 55. 55. 55. 56. 56. 56. 56.  4984 57. 57. 57. 57. 58. 58. 58. 58.  4985 59. 59. 59. 59. 59. 60. 60. 60.  4986 61. 61. 61. 61. 61. 62. 62. 62.  4987 63. 63. 63. 63. 63. 64. 64. 64.  4988 65. 65. 65. 65. 66. 66. 66. 66.  4989 67. 67. 67. 68. 68. 68. 68. 68.  4990 69. 69. 70. 70. 70. 70. 70. 71.  4991 71. 72. 72. 72. 72. 72. 73. 73.  4992 73. 74. 74. 74. 74. 75. 75. 75.  4993 76. 76. 76. 76. 77. 77. 77. 77.  4994 78. 78. 78. 79. 79. 79. 79. 80. 

33
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE AREA TABLE IS IN ACRES THE ELEVATION INCREMENT IS IN ONE TENTH  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  4995 80. 80. 81. 81. 81. 81. 82. 82.  4996 82. 83. 83. 83. 84. 84. 84. 85.  4997 85. 86. 86. 86. 87. 87. 87. 88.  4998 88. 89. 89. 90. 90. 91. 91. 92.  4999 93. 94. 94. 95. 95. 96. 96. 97.  5000 98. 99. 100. 100. 101. 102. 102. 103.  5001 105. 106. 106. 107. 108. 108. 109. 110.  5002 112. 112. 113. 114. 115. 116. 117. 117.  5003 120. 121. 122. 122. 123. 124. 125. 126.  5004 128. 129. 130. 131. 131. 132. 133. 134.  5005 136. 137. 138. 139. 139. 140. 141. 142.  5006 144. 145. 146. 146. 147. 148. 149. 149.  5007 152. 152. 153. 154. 155. 155. 156. 157.  5008 159. 160. 161. 161. 162. 163. 163. 164.  5009 166. 167. 168. 168. 169. 170. 170. 171.  5010 173. 174. 174. 175. 175. 176. 177. 177.  5011 179. 179. 180. 181. 181. 182. 182. 183.  5012 185. 185. 186. 186. 187. 187. 188. 188.  5013 190. 190. 191. 191. 192. 192. 193. 194.  5014 195. 196. 196. 197. 197. 198. 198. 199.  5015 200. 201. 201. 202. 202. 203. 203. 204.  5016 205. 206. 206. 207. 207. 208. 208. 209.  5017 210. 211. 211. 212. 212. 213. 214. 214.  5018 216. 216. 217. 217. 218. 218. 219. 219.  5019 221. 222. 222. 223. 223. 224. 224. 225.  5020 227. 227. 228. 228. 229. 229. 230. 230.  5021 232. 233. 233. 234. 234. 235. 235. 236.  5022 238. 238. 239. 239. 240. 241. 241. 242.  5023 244. 244. 245. 245. 246. 246. 247. 248.  5024 249. 250. 250. 251. 252. 252. 253. 253.  5025 255. 255. 256. 257. 257. 258. 258. 259.  5026 260. 261. 262. 262. 263. 263. 264. 264.  5027 266. 267. 267. 268. 268. 269. 269. 270.  5028 272. 272. 273. 273. 274. 274. 275. 275.  5029 277. 278. 278. 279. 279. 280. 280. 281.  5030 283. 283. 284. 284. 285. 285. 286. 287.  5031 288. 289. 289. 290. 290. 291. 291. 292.  5032 294. 294. 295. 295. 296. 296. 297. 297.  5033 299. 299. 300. 301. 301. 302. 302. 303.  5034 304. 305. 305. 306. 306. 307. 307. 308. 

34
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE AREA TABLE IS IN ACRES THE ELEVATION INCREMENT IS IN ONE TENTH  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  5035 309. 310. 310. 311. 311. 312. 312. 313.  5036 314. 315. 315. 316. 317. 317. 318. 318.  5037 320. 320. 321. 321. 322. 322. 323. 323.  5038 325. 326. 326. 327. 327. 328. 328. 329.  5039 330. 331. 331. 332. 332. 333. 333. 334.  5040 335. 336. 337. 337. 338. 338. 339. 339.  5041 341. 341. 342. 342. 343. 343. 344. 344.  5042 346. 346. 347. 347. 348. 348. 349. 349.  5043 351. 351. 352. 352. 353. 353. 354. 354.  5044 356. 356. 357. 357. 358. 358. 359. 359.  5045 361. 361. 362. 362. 363. 363. 364. 364.  5046 366. 366. 367. 367. 368. 368. 369. 369.  5047 371. 371. 372. 372. 373. 374. 374. 375.  5048 376. 377. 377. 378. 378. 379. 379. 380.  5049 381. 382. 383. 383. 384. 384. 385. 385.  5050 387. 387. 388. 388. 389. 389. 390. 391.  5051 392. 393. 393. 394. 394. 395. 395. 396.  5052 398. 398. 399. 399. 400. 400. 401. 401.  5053 403. 403. 404. 405. 405. 406. 406. 407.  5054 408. 409. 409. 410. 411. 411. 412. 412.  5055 414. 415. 415. 416. 416. 417. 418. 418.  5056 420. 420. 421. 421. 422. 423. 423. 424.  5057 425. 426. 427. 427. 428. 428. 429. 429.  5058 431. 432. 432. 433. 433. 434. 435. 435.  5059 437. 438. 438. 439. 439. 440. 441. 441.  5060 443. 444. 444. 445. 445. 446. 447. 447.  5061 449. 450. 450. 451. 452. 452. 453. 453.  5062 455. 456. 457. 457. 458. 459. 459. 460.  5063 462. 463. 463. 464. 465. 465. 466. 467.  5064 469. 470. 470. 471. 472. 472. 473. 474.  5065 476. 476. 477. 478. 479. 479. 480. 481.  5066 483. 483. 484. 485. 485. 486. 487. 487.  5067 489. 490. 491. 491. 492. 493. 493. 494.  5068 496. 497. 498. 498. 499. 500. 500. 501.  5069 503. 504. 504. 505. 506. 506. 507. 508.  5070 510. 510. 511. 512. 513. 513. 514. 515.  5071 517. 518. 518. 519. 520. 521. 521. 522.  5072 524. 525. 526. 527. 527. 528. 529. 530. 

35

 5074 539. 540. 540. 541. 542. 542. 543. 544.  5073 532. 532. 533. 534. 535. 535. 536. 537. 
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE AREA TABLE IS IN ACRES THE ELEVATION INCREMENT IS IN ONE TENTH  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  5075 546. 547. 547. 548. 549. 549. 550. 551.  5076 553. 554. 554. 555. 556. 556. 557. 558.  5077 560. 561. 561. 562. 563. 563. 564. 565.  5078 567. 568. 568. 569. 570. 570. 571. 572.  5079 574. 575. 576. 576. 577. 578. 578. 579.  5080 581. 582. 583. 584. 584. 585. 586. 586.  5081 589. 589. 590. 591. 591. 592. 593. 594.  5082 596. 597. 597. 598. 599. 600. 600. 601.  5083 603. 604. 605. 606. 606. 607. 608. 609.  5084 611. 612. 612. 613. 614. 614. 615. 616.  5085 618. 618. 619. 620. 621. 621. 622. 623.  5086 625. 625. 626. 627. 628. 629. 629. 630.  5087 632. 633. 634. 635. 636. 636. 637. 638.  5088 640. 641. 642. 642. 643. 644. 644. 645.  5089 647. 648. 649. 649. 650. 651. 651. 652.  5090 654. 655. 655. 656. 656. 657. 658. 658.  5091 660. 661. 661. 662. 663. 663. 664. 664.  5092 666. 667. 668. 668. 669. 669. 670. 671.  5093 672. 673. 674. 674. 675. 675. 676. 677.  5094 679. 679. 680. 681. 681. 682. 683. 684.  5095 686. 686. 687. 688. 689. 689. 690. 691.  5096 693. 693. 694. 695. 695. 696. 697. 697.  5097 699. 700. 701. 701. 702. 703. 703. 704.  5098 706. 707. 707. 708. 709. 709. 710. 710.  5099 712. 713. 714. 714. 715. 715. 716. 717.  5100 719. 719. 720. 721. 721. 722. 722. 723.  5101 725. 726. 726. 727. 728. 728. 729. 730.  5102 732. 732. 733. 734. 734. 735. 736. 736.  5103 738. 739. 739. 740. 741. 741. 742. 743.  5104 745. 746. 746. 747. 748. 749. 750. 750.  5105 753. 754. 755. 755. 756. 757. 758. 759.  5106 761. 762. 763. 763. 764. 765. 766. 767.  5107 769. 

36
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE CAPACITY TABLE IS IN ACRE FEET THE ELEVATION INCREMENT IS  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  4955 0. 0. 0. 0. 0. 0. 0. 0.  4956 0. 0. 1. 1. 1. 1. 1. 1.  4957 2. 2. 2. 2. 3. 3. 3. 4.  4958 5. 5. 5. 6. 6. 6. 7. 7.  4959 8. 9. 9. 10. 10. 11. 11. 12.  4960 13. 14. 14. 15. 16. 16. 17. 17.  4961 19. 20. 21. 21. 22. 23. 23. 24.  4962 26. 27. 28. 29. 29. 30. 31. 32.  4963 34. 35. 36. 37. 38. 39. 40. 41.  4964 44. 45. 46. 47. 48. 49. 50. 51.  4965 55. 56. 57. 58. 59. 61. 62. 63.  4966 67. 68. 69. 71. 72. 73. 75. 76.  4967 80. 82. 83. 85. 86. 88. 89. 91.  4968 96. 97. 99. 101. 102. 104. 106. 108.  4969 113. 115. 117. 119. 121. 123. 125. 127.  4970 133. 135. 137. 139. 142. 144. 146. 149.  4971 156. 158. 160. 163. 165. 168. 171. 173.  4972 181. 184. 186. 189. 192. 195. 198. 200.  4973 209. 212. 215. 218. 221. 225. 228. 231.  4974 241. 244. 247. 250. 254. 257. 261. 264.  4975 275. 278. 282. 285. 289. 293. 296. 300.  4976 311. 315. 319. 323. 327. 331. 335. 339.  4977 351. 355. 359. 363. 367. 371. 376. 380.  4978 393. 397. 401. 406. 410. 415. 419. 424.  4979 437. 442. 446. 451. 456. 460. 465. 470.  4980 484. 489. 494. 499. 504. 508. 513. 518.  4981 533. 538. 543. 549. 554. 559. 564. 569.  4982 585. 590. 595. 601. 606. 611. 617. 622.  4983 638. 644. 649. 655. 660. 666. 672. 677.  4984 694. 700. 706. 711. 717. 723. 729. 734.  4985 752. 758. 764. 770. 776. 782. 788. 794.  4986 812. 818. 824. 830. 836. 842. 848. 855.  4987 873. 879. 886. 892. 898. 905. 911. 918.  4988 937. 943. 950. 956. 963. 969. 976. 983.  4989 1003. 1009. 1016. 1023. 1029. 1036. 1043. 1050.  4990 1071. 1077. 1084. 1091. 1098. 1105. 1112. 1119.  4991 1141. 1148. 1155. 1162. 1169. 1177. 1184. 1191.  4992 1213. 1220. 1228. 1235. 1243. 1250. 1258. 1265. 

37

 4994 1365. 1372. 1380. 1388. 1396. 1404. 1412. 1420.  4993 1288. 1295. 1303. 1311. 1318. 1326. 1334. 1341. 
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE CAPACITY TABLE IS IN ACRE FEET THE ELEVATION INCREMENT IS  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  4995 1444. 1452. 1460. 1468. 1476. 1484. 1492. 1500.  4996 1525. 1533. 1541. 1550. 1558. 1567. 1575. 1583.  4997 1609. 1617. 1626. 1635. 1643. 1652. 1661. 1669.  4998 1696. 1705. 1714. 1723. 1732. 1741. 1750. 1759.  4999 1787. 1796. 1806. 1815. 1825. 1834. 1844. 1854.  5000 1883. 1893. 1903. 1913. 1923. 1933. 1943. 1953.  5001 1985. 1995. 2006. 2016. 2027. 2038. 2049. 2060.  5002 2093. 2104. 2115. 2127. 2138. 2150. 2161. 2173.  5003 2209. 2221. 2233. 2245. 2257. 2270. 2282. 2295.  5004 2333. 2345. 2358. 2371. 2385. 2398. 2411. 2424.  5005 2465. 2478. 2492. 2506. 2520. 2534. 2548. 2562.  5006 2605. 2619. 2634. 2649. 2663. 2678. 2693. 2708.  5007 2753. 2768. 2783. 2799. 2814. 2830. 2845. 2861.  5008 2908. 2924. 2940. 2956. 2973. 2989. 3005. 3022.  5009 3071. 3088. 3104. 3121. 3138. 3155. 3172. 3189.  5010 3241. 3258. 3275. 3293. 3310. 3328. 3346. 3363.  5011 3417. 3435. 3453. 3471. 3489. 3507. 3525. 3543.  5012 3598. 3617. 3635. 3654. 3673. 3691. 3710. 3729.  5013 3786. 3805. 3824. 3843. 3862. 3881. 3900. 3920.  5014 3978. 3998. 4017. 4037. 4057. 4076. 4096. 4116.  5015 4176. 4196. 4216. 4236. 4256. 4276. 4297. 4317.  5016 4378. 4399. 4420. 4440. 4461. 4482. 4502. 4523.  5017 4586. 4607. 4628. 4650. 4671. 4692. 4713. 4735.  5018 4799. 4821. 4842. 4864. 4886. 4908. 4930. 4951.  5019 5018. 5040. 5062. 5084. 5106. 5129. 5151. 5174.  5020 5241. 5264. 5287. 5310. 5332. 5355. 5378. 5401.  5021 5471. 5494. 5517. 5540. 5564. 5587. 5611. 5634.  5022 5706. 5729. 5753. 5777. 5801. 5825. 5849. 5873.  5023 5946. 5970. 5995. 6019. 6044. 6069. 6093. 6118.  5024 6193. 6217. 6242. 6268. 6293. 6318. 6343. 6368.  5025 6445. 6470. 6496. 6521. 6547. 6573. 6599. 6624.  5026 6702. 6728. 6755. 6781. 6807. 6833. 6860. 6886.  5027 6966. 6992. 7019. 7046. 7072. 7099. 7126. 7153.  5028 7234. 7262. 7289. 7316. 7343. 7371. 7398. 7426.  5029 7509. 7537. 7564. 7592. 7620. 7648. 7676. 7704.  5030 7789. 7817. 7845. 7874. 7902. 7931. 7959. 7988.  5031 8074. 8103. 8132. 8161. 8190. 8219. 8248. 8277.  5032 8365. 8394. 8424. 8453. 8483. 8512. 8542. 8572.  5033 8661. 8691. 8721. 8751. 8781. 8811. 8842. 8872.  5034 8963. 8993. 9024. 9054. 9085. 9116. 9146. 9177. 

38
 LAKE ARROWHEAD - CALIFORNIA (A

  2008 AREA-CAPACITY TABLES  THE CAPACITY TABLE IS IN ACRE FEET THE ELEVATION INCREMENT IS  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  5035 9270. 9301. 9332. 9363. 9394. 9425. 9456. 9488.  5036 9582. 9613. 9645. 9676. 9708. 9739. 9771. 9803.  5037 9899. 9931. 9963. 9995. 10027. 10059. 10091. 10124. 1 5038 10221. 10254. 10286. 10319. 10351. 10384. 10417. 10450. 1 5039 10549. 10582. 10615. 10648. 10681. 10714. 10748. 10781. 1 5040 10882. 10915. 10949. 10982. 11016. 11050. 11084. 11118. 1 5041 11220. 11254. 11288. 11322. 11356. 11390. 11425. 11459. 1 5042 11563. 11597. 11632. 11667. 11701. 11736. 11771. 11806. 1 5043 11911. 11946. 11981. 12016. 12052. 12087. 12122. 12158. 1 5044 12264. 12300. 12335. 12371. 12407. 12442. 12478. 12514. 1 5045 12622. 12658. 12694. 12731. 12767. 12803. 12839. 12876. 1 5046 12985. 13022. 13058. 13095. 13132. 13169. 13206. 13242. 1 5047 13353. 13391. 13428. 13465. 13502. 13540. 13577. 13614. 1 5048 13727. 13765. 13802. 13840. 13878. 13916. 13954. 13992. 1 5049 14106. 14144. 14182. 14221. 14259. 14297. 14336. 14374. 1 5050 14490. 14529. 14567. 14606. 14645. 14684. 14723. 14762. 1 5051 14879. 14919. 14958. 14997. 15037. 15076. 15116. 15155. 1 5052 15274. 15314. 15354. 15394. 15434. 15474. 15514. 15554. 1 5053 15675. 15715. 15755. 15796. 15836. 15877. 15917. 15958. 1 5054 16080. 16121. 16162. 16203. 16244. 16285. 16326. 16367. 1 5055 16491. 16533. 16574. 16616. 16657. 16699. 16741. 16783. 1 5056 16908. 16950. 16992. 17034. 17077. 17119. 17161. 17203. 1 5057 17331. 17373. 17416. 17459. 17501. 17544. 17587. 17630. 1 5058 17759. 17802. 17845. 17889. 17932. 17975. 18019. 18062. 1 5059 18193. 18237. 18281. 18325. 18368. 18412. 18456. 18500. 1 5060 18633. 18677. 18722. 18766. 18811. 18855. 18900. 18945. 1 5061 19079. 19124. 19169. 19214. 19259. 19304. 19350. 19395. 1 5062 19531. 19577. 19622. 19668. 19714. 19760. 19806. 19852. 1 5063 19990. 20036. 20083. 20129. 20175. 20222. 20268. 20315. 2 5064 20456. 20502. 20549. 20596. 20644. 20691. 20738. 20785. 2 5065 20928. 20975. 21023. 21071. 21119. 21167. 21215. 21263. 2 5066 21407. 21455. 21504. 21552. 21601. 21649. 21698. 21747. 2 5067 21893. 21942. 21991. 22040. 22090. 22139. 22188. 22237. 2 5068 22386. 22436. 22485. 22535. 22585. 22635. 22685. 22735. 2 5069 22886. 22936. 22986. 23037. 23087. 23138. 23188. 23239. 2 5070 23392. 23443. 23494. 23545. 23596. 23648. 23699. 23750. 2 5071 23905. 23957. 24009. 24061. 24113. 24165. 24217. 24269. 2 5072 24426. 24478. 24531. 24583. 24636. 24689. 24742. 24795. 2 5073 24954. 25007. 25060. 25114. 25167. 25221. 25274. 25328. 2 5074 25489. 25543. 25597. 25651. 25705. 25760. 25814. 25868. 2

39
40

 LAKE ARROWHEAD - CALIFORNIA (A  2008 AREA-CAPACITY TABLES  THE CAPACITY TABLE IS IN ACRE FEET THE ELEVATION INCREMENT IS  ELEV. FEET 0 .1 .2 .3 .4 .5 .6 .7  5075 26032. 26086. 26141. 26196. 26251. 26305. 26360. 26415. 2 5076 26581. 26636. 26692. 26747. 26803. 26858. 26914. 26970. 2 5077 27137. 27193. 27249. 27306. 27362. 27418. 27475. 27531. 2 5078 27701. 27757. 27814. 27871. 27928. 27985. 28042. 28099. 2 5079 28271. 28329. 28386. 28444. 28501. 28559. 28617. 28675. 2 5080 28849. 28907. 28965. 29024. 29082. 29140. 29199. 29258. 2 5081 29434. 29493. 29552. 29611. 29670. 29729. 29788. 29848. 2 5082 30026. 30086. 30145. 30205. 30265. 30325. 30385. 30445. 3 5083 30626. 30686. 30747. 30807. 30868. 30928. 30989. 31050. 3 5084 31233. 31294. 31355. 31417. 31478. 31539. 31601. 31662. 3 5085 31847. 31909. 31971. 32033. 32095. 32157. 32219. 32282. 3 5086 32469. 32531. 32594. 32656. 32719. 32782. 32845. 32908. 3 5087 33097. 33160. 33224. 33287. 33351. 33414. 33478. 33542. 3 5088 33734. 33798. 33862. 33926. 33990. 34055. 34119. 34183. 3 5089 34377. 34442. 34507. 34572. 34637. 34702. 34767. 34832. 3 5090 35028. 35093. 35159. 35224. 35290. 35356. 35421. 35487. 3 5091 35685. 35751. 35817. 35883. 35949. 36016. 36082. 36148. 3 5092 36348. 36415. 36481. 36548. 36615. 36682. 36749. 36816. 3 5093 37017. 37085. 37152. 37219. 37287. 37354. 37422. 37490. 3 5094 37693. 37761. 37829. 37897. 37965. 38033. 38101. 38170. 3 5095 38375. 38444. 38512. 38581. 38650. 38719. 38788. 38857. 3 5096 39064. 39134. 39203. 39272. 39342. 39411. 39481. 39551. 3 5097 39760. 39830. 39900. 39970. 40041. 40111. 40181. 40252. 4 5098 40463. 40534. 40604. 40675. 40746. 40817. 40888. 40959. 4 5099 41172. 41244. 41315. 41386. 41458. 41529. 41601. 41673. 4 5100 41888. 41960. 42032. 42104. 42176. 42248. 42320. 42392. 4 5101 42610. 42682. 42755. 42827. 42900. 42973. 43046. 43119. 4 5102 43338. 43411. 43484. 43558. 43631. 43705. 43778. 43852. 4 5103 44073. 44147. 44221. 44295. 44369. 44443. 44517. 44591. 4 5104 44814. 44889. 44964. 45038. 45113. 45188. 45263. 45338. 4 5105 45563. 45639. 45714. 45789. 45865. 45941. 46016. 46092. 4 5106 46320. 46396. 46473. 46549. 46625. 46702. 46778. 46855. 4 5107 47085.