Abstract

The Spokane Valley–Rathdrum Prairie aquifer is the sole source of drinking water for residents in a 

rapidly growing area in Spokane County, Washington, and Bonner and Kootenai Counties, Idaho. In 2004, the 

U.S. Geological Survey, Washington State Department of Ecology, and Idaho Department of Water Resources 

developed a comprehensive study of the ground- and surface-water resources in the Spokane Valley–Rathdrum 

Prairie area. As a part of the study, the U.S. Geological Survey used water levels measured in 268 wells in 

September 2004 to construct a map of ground-water levels in the aquifer. Water-level data indicate that in late 

summer ground water flows generally southward from Hoodoo Valley to Coeur d’Alene and then westward 

toward Spokane. Water-table gradients ranged from 96 to 8 feet per mile.

Introduction

The Spokane Valley–Rathdrum Prairie (SVRP) aquifer is the sole source of drinking water for more 

than 400,000 residents in Spokane County, Washington, and Bonner and Kootenai Counties, Idaho. The area 

includes the rapidly growing cities of Spokane, Washington, and Coeur d’Alene and Post Falls, Idaho. Recent 

and projected urban, suburban, and industrial/commercial growth has raised concerns about potential future 

effects on water resources in the area. Water-resource concerns include growing demands on ground water, low 

streamflow in reaches of the Spokane and Little Spokane Rivers, and water-quality problems associated with 

land-use activities. 

The SVRP aquifer consists primarily of thick layers of coarse-grained sediments—gravels, cobbles, and 

boulders—deposited during a series of floods resulting from repeated collapse of the ice dam that impounded 

ancient glacial Lake Missoula (Bretz, 1930). Sources of recharge to the aquifer include infiltration from 

precipitation and irrigation water, leakage from the Spokane and Little Spokane Rivers and adjacent lakes, 

and surface- and ground-water inflow from adjoining highlands. The aquifer discharges into the Spokane and 

Little Spokane Rivers and Long Lake (Lake Spokane) and through withdrawals from wells. The aquifer was 

designated a “Sole Source Aquifer” by the Environmental Protection Agency (USEPA) in 1978 (under the 

provisions of the Federal Safe Drinking Water Act of 1974) in response to local concerns about the vulnerability 

of the aquifer to water-quality degradation. The USEPA defines such an aquifer as one that supplies at least 

50 percent of the drinking water consumed in the area overlying the aquifer (U.S. Environmental Protection 

Agency, 2000). Generally, populations served by a sole-source aquifer do not have a viable alternative drinkingwater source.

Water-management issues in this rapidly growing bi-State area have increasingly become regional in 

nature. In response, several groups have initiated a comprehensive, regional study of the SVRP aquifer to 

serve as a scientific basis for addressing regional water concerns. In 2004, the Washington State Department 

of Ecology (WADOE), the Idaho Department of Water Resources (IDWR), and the U.S. Geological Survey 

(USGS), in consultation with local stakeholders, developed a comprehensive plan of study to gain a better 

understanding of surface- and ground-water resources in the SVRP study area. The initial study objective is the 

development of an extensive data set to provide an improved scientific basis for water management of the SVRP 

aquifer. These data will allow construction of a numerical ground-water flow model to support the management 

of ground and surface water in the SVRP area. As part of the study, the USGS used water levels measured in 

268 wells in the SVRP in September 2004 to construct a map of ground-water levels in the aquifer during late 

summer.

The purpose of this report is to present the map of ground-water levels in the SVRP for September 2004, 

the water-level data collected at the 268 wells, and a brief summary of ground-water flow and water-table 

gradients in late summer.

Acknowledgments

This report would not have been possible without the cooperation of the well owners that allowed access 

to their property and wells, and of the concerted effort by dedicated personnel of many local, State, and 

Federal agencies. Special thanks to the Idaho Department of Water Resources, Washington State Department 

of Ecology, Spokane County, the water districts represented by the Spokane Aquifer Joint Board, and Kootenai 

and Bonner Counties. The following individuals contributed significantly to the review of this report: James R. 

Bartolino, U.S. Geological Survey, Idaho; Rodney R. Caldwell, U.S. Geological Survey, Montana; John Covert, 

Washington State Department of Ecology; and Sue C. Kahle, U.S. Geological Survey, Washington.

Description of Study Area

The approximately 370-square-mile (mi2) SVRP aquifer underlies a relatively flat, alluvium-covered 

valley surrounded by bedrock highlands. The roughly L-shaped aquifer extends south from Lake Pend Oreille 

to Coeur d’Alene Lake and westward across the Washington-Idaho state line to near Nine Mile Falls northwest 

of the city of Spokane. Land-surface altitudes in the valley range from about 1,500 feet (ft) near Long Lake to 

nearly 2,600 ft near Athol. Several lakes are located along the margins of the aquifer, the largest of which are 

13

12 11

47°40’37”

38”

33” 117°

19’

32”

34”

117°

19’

53”

54”

56” 55”

10

47°40’51”

47°40’52”

53”

52”

58”

117°

19’

57”

Well 10’s original 1-second grid number

Well 10’s true position within 1-second grid.

GPS location number: 474051.4–1171957.8

12 474037 1171933 02

11 474037 1171933 01

13 474037 1171933 03

Wells 11-13’s original 1-second grid numbers

Well 11-13’s true position within 1-second grid.

GPS location number:

474037.36–1171932.66

13 474037.34–1171932.34

12 

11 474037.40–1171932.55

10 474052 1171953 01

Coeur d’Alene Lake and Lake Pend Oreille in Idaho. With the exception of the Spokane and Little Spokane 

Rivers, surface drainage generally is lacking because of the high permeability of valley-bottom soils.

Ground-water use in the area primarily is public supply, domestic, irrigation, and industrial. Land use in 

the area overlying the aquifer generally is agriculture and urban. Cities overlying and supplied by the aquifer 

include the Spokane metropolitan area in Washington and Coeur d’Alene and Post Falls in Idaho. The upland 

areas surrounding the aquifer area are mostly coniferous forests or residential housing. 

The areal extent of the SVRP aquifer has been defined differently by successive authors over time. Many 

recent aquifer-related documents have used a modified version of the original Spokane Valley–Rathdrum Prairie 

Sole Source Aquifer boundary that was designated by the USEPA in 1978. On the basis of recently completed 

surficial-geology maps, S.C. Kahle (U.S. Geological Survey, written commun., 2005) redefined the aquifer 

boundary to include additional unconsolidated coarse-grained deposits. 

The thickness of the SVRP aquifer generally is unknown except along its margins where wells have 

penetrated its entire thickness. Because many wells completed in the SVRP aquifer are extremely productive, 

very few extend more than 100 ft into the saturated zone.1

The SVRP aquifer is underlain and laterally bounded by units of relatively low permeability, including 

the Columbia River Basalt, the Latah Formation, and Precambrian to Tertiary metasedimentary and igneous 

rocks exposed in the highlands surrounding the aquifer. The Columbia River Basalts and associated Latah 

Formation interbeds can produce adequate quantities of water for domestic use, but are discontinuous in nature 

and are not considered major aquifers within the SVRP study area. The crystalline structure of the metamorphic 

and intrusive igneous rocks generally inhibits their ability to store and transmit water, however, weathered or 

fractured zones within these rocks can transmit useable amounts of ground water. 

Ground-Water Levels in the Spokane Valley–Rathdum Prairie Aquifer, 

September 2004

Water levels in 268 wells within and surrounding the SVRP study area were measured by personnel from 

IDWR, WADOE, and the USGS during September 13-20, 2004 (table 1). Most measurements were made using 

either steel tapes or calibrated electric tapes, but a limited number of measurements were taken from wells 

(primarily for municipal supply) equipped with a calibrated airline. 

Most of the wells included in the September 2004 synoptic water-level measurement were revisited in 

October 2004 to determine land-surface altitude using a differential global positioning system (GPS). For those 

wells that were not surveyed with a differential GPS, elevations were determined from levels surveyed from 

benchmarks or were estimated from 1:24,000-scale topographic maps.

Water levels measured during the study were used to constuct a map of ground-water levels in the aquifer 

during late summer. Water-level contours were drawn using static water levels measured in wells that were 

completed in outwash deposits (112OTSH) and had land-surface altitudes with accuracies of ± 0.01–5.0 ft. 

Wells with less-accurate land-surface altitudes (±10.0 ft) were given less weight in mapping water levels. Water 

levels that were measured in wells completed in basalt (122CBRV), granite (210CRCS), or slate (400PRCD), or 

completed in multiple aquifers were not used. The map was constucted using contour intervals of 20 ft except 

for contours greater than 2,060 ft, which have 40-ft intervals.

Water-level measurements in September 2004 indicate that depth to water in the SVRP aquifer ranges from 

near land surface, to the west near Spokane along the Spokane and Little Spokane Rivers, to more than 540 ft 

below land surface in northern Rathdrum Prairie near Athol (table 1). The water-level contours demonstrate 

that the water table in the SVRP aquifer generally reflects the land-surface topography and slopes from 

Hoodoo Valley and Lake Pend Oreille, Idaho to Nine Mile Falls, Washington. Ground water generally flows 

in a southward direction from the Hoodoo Valley area (water-level altitude of about 2,160 ft), towards the city 

of Coeur d’Alene, and then westward towards the city of Spokane (altitude of about 1,540 ft near the Little 

Spokane River). 

The water-table gradient ranges from relatively flat in the central Rathdrum Prairie and Spokane Valley 

areas to steep along the margins of the aquifer. The water-table gradient in the Rathdrum Prairie area in the 

northern part of the aquifer is about 22 feet per mile (ft/mi), whereas the gradient in the main body of the 

aquifer from Hayden, Idaho, to Spokane, Washington, is about 8 ft/mi. Gradients are steeper elsewhere in the 

aquifer: 77 ft/mi in the Chilco Channel, 61 ft/mi in the Bayview area, 40 ft/mi in Spirit Valley, 22 ft/mi in the 

Hillyard area, 17 ft/mi along the Spokane River west of Five Mile Prairie, and ranging from about 69 to 96 ft/mi 

near Newman, Hayden, and Hauser Lakes.

References Cited

Bretz, J H., 1930, Lake Missoula and the Spokane floods [abs.]: Geological Society of America Bulletin, v. 41, 

p. 92-93.

U.S. Environmental Protection Agency, 2000, Sole source aquifer protection program overview: U.S. 

Environmental Protection Agency data available on the Web, accessed June 6, 2001, at 

http://www.epa.gov/ogwdw/swp/ssa.html

1

 Known depths of wells measured in September 2004 ranged from 22 ft to 700 ft below land surface.

Scientific Investigations Map 2905

Campbell, A.M., Ground-Water Levels in the Spokane Valley – Rathdrum Prairie Aquifer, 

Spokane County, Washington, and Bonner and Kootenai Counties, Idaho, September 2004

Prepared in cooperation with

IDAHO DEPARTMENT OF WATER RESOURCES and

WASHINGTON STATE DEPARTMENT OF ECOLOGY

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

Ground-Water Levels in the Spokane Valley – Rathdrum Prairie Aquifer, 

Spokane County, Washington, and Bonner and Kootenai Counties, Idaho, September 2004

By Annette M. Campbell

2005

Table 1. Water-level information for wells measured in the Spokane Valley–Rathdrum Prairie study area, 

September 2004.

[Wells in italics either were of lesser importance in determining water-level contours or, if completed in multiple aquifer units, were 

not used. Method used to derive land-surface altitude: D, differential global positioning system; L, survey level; M, topographic 

map. Aquifer unit in which well completed: 112OTSH, outwash deposits; 122CBRV, basalt; 210CRCS, granite; 400PRCS, slate; 

Multiple, multiple aquifer units. Well status: P, pumping; R, recently pumped; S, nearby pumping; T, nearby recently pumped; V, 

foreign substance; –, static. Method of water-level measurement: A, airline; C, calibrated airline: G, pressure gage; S, steel tape; 

T, electric tape; V, calibrated electric tape. Italicized informaton indicates less than ideal conditions. Abbreviations: NAVD 88, 

North American Vertical Datum of 1988]

Map

identification No.

Well-site

identification No.

Altitude 

of land 

surface

(in feet

above 

NAVD 88)

Accuracy

of landsurface

altitude

(feet)

Method 

used to 

derive landsurface 

altitude

Aquifer 

unit in 

which well 

completed

Water

level 

(in feet

above 

NAVD 88)

Depth of 

water 

(in feet

below land 

surface)

Well 

status

Method 

of waterlevel 

measurement

0 474142117281801 1,701.20 0.1 D 112OTSH 1,654.22 46.98 – V

1 474047117280601 1,689.65 .1 D 112OTSH 1,668.81 20.84 – V

2 473928117275001 1,804.00 10 M 112OTSH 1,698.10 105.90 – S

3 473924117273701 1,735.39 .01 L 112OTSH 1,695.56 39.83 – V

4 474200117223901 2,051.32 .1 D 112OTSH 1,860.32 191 – V

5 474143117222801 2,043.34 .1 D 112OTSH 1,862.88 180.46 – V

6 474045117255201 1,904.00 10 M 112OTSH 1,759.55 144.45 – V

7 474100117233601 1,950.25 .01 D 112OTSH 1,861.94 88.31 – V

8 474054117232401 1,948.42 .1 D 112OTSH 1,863.45 84.97 – V

Map

identification No.

Well-site

identification No.

Altitude 

of land 

surface

(in feet

above 

NAVD 88)

Accuracy

of landsurface

altitude

(feet)

Method 

used to 

derive landsurface 

altitude

Aquifer 

unit in 

which well 

completed

Water

level 

(in feet

above 

NAVD 88)

Depth of 

water 

(in feet

below land 

surface)

Well 

status

Method 

of waterlevel 

measurement

9 474026117231401 1,887.61 .1 D 112OTSH 1,866.17 21.44 – V

10 474052117195301 1,910.22 .1 D 112OTSH 1,875.76 34.46 – V

11 474037117193301 1,952.00 2.5 M 112OTSH 1,883.03 68.97 – V

12 474037117193302 1,952.00 2.5 M 112OTSH 1,882.50 69.50 – V

13 474037117193303 1,952.00 2.5 M 112OTSH 1,882.16 69.84 – V

14 474059117185601 1,951.52 .1 D 112OTSH 1,889.91 61.61 – V

15 474005117182601 1,950.96 .1 D 112OTSH 1,891.94 59.02 – A

16 473958117185801 1,943.34 .1 D 112OTSH 1,887.53 55.81 – V

17 473958117113401 1,944.00 5 M 112OTSH 1,887.79 56.21 – V

18 473955117204201 1,934.00 20 M 112OTSH 1,867.35 66.65 – V

19 473950117222501 1,925.59 .1 D 112OTSH 1,870.38 55.21 – V

20 473931117220301 1,937.83 .1 D 112OTSH 1,871.94 65.89 – V

21 473938117234701 1,880.63 .1 D 112OTSH 1,868.45 12.18 – V

22 473912117205101 1,932.00 2.5 M 112OTSH 1,878.57 53.43 – V

23 473912117205102 1,932.00 2.5 M 112OTSH 1,878.60 53.40 – V

24 473912117205103 1,932.00 2.5 M 112OTSH 1,878.68 53.32 – V

25 473902117214601 1,919.63 .1 L 112OTSH 1,874.98 44.65 – V

26 473920117194502 1,939.00 5 M unknown 1,875.93 63.07 – V

27 473900117185201 2,030.00 20 M 112OTSH 1,894.95 135.05 – V

28 474150117114701 2,055.37 .1 D 112OTSH 1,941.29 114.08 – V

29 474110117104701 2,021.92 .1 D 112OTSH 1,947.34 74.58 – V

Well- and miscellaneous site-numbering system

The well- and miscellaneous site-numbering system of the U.S. Geological Survey is based on latitude and longitude. A unique 

15-digit number is assigned for each site: the first six digits denote degrees, minutes, and seconds of latitude, the next seven digits 

denote degrees, minutes, and seconds of longitude, and the last two digits (assigned sequentially) identify the wells within a 1-second 

grid. Datums are either the North American Datum of 1927 or the North American Datum of 1983, depending on when the site was 

established; recently assigned site-identification numbers use North American Datum of 1983. Although the USGS site-identification 

number was established from geographic coordinates, it should not be used to locate a site because the unique site number is 

permanent and does not change if a more accurate location is determined at a later time.

Map

identification No.

Well-site

identification No.

Altitude 

of land 

surface

(in feet

above 

NAVD 88)

Accuracy

of landsurface

altitude

(feet)

Method 

used to 

derive landsurface 

altitude

Aquifer 

unit in 

which well 

completed

Water

level 

(in feet

above 

NAVD 88)

Depth of 

water 

(in feet

below land 

surface)

Well 

status

Method 

of waterlevel 

measurement

30 474152117120801 2,041.97 .1 D 112OTSH 1,937.52 104.45 – V

31 474121117120701 2,017.45 .1 D 112OTSH 1,937.01 80.44 – V

32 474152117133801 1,993.45 .1 D 112OTSH 1,931.42 62.03 – V

33 474134117143202 1,983.22 .1 D 112OTSH 1,908.63 74.59 – A

34 474117117142401 1,993.01 .1 D 112OTSH 1,910.96 82.05 R V

35 474155117164801 1,998.83 .1 D 112OTSH 1,893.53 105.30 – A

36 474346117154101 1,986.10 1.0 D 112OTSH 1,901.10 85.00 – A

37 474141117174101 1,966.14 .1 D 112OTSH 1,902.00 64.14 – V

38 474057117174101 1,958.90 .1 D 112OTSH 1,897.22 61.68 – V

39 474034117170001 1,979.63 .1 D 112OTSH 1,900.69 78.94 – V

40 474106117165101 1,950.22 .1 D 112OTSH 1,903.97 46.25 – V

41 474039117153201 1,980.33 .1 D 112OTSH 1,894.73 85.60 – A

42 474058117130601 1,977.90 .1 D 112OTSH 1,925.70 52.20 – V

43 474020117125903 1,995.40 .1 D 112OTSH 1,917.40 78.00 S A

44 474026117115301 1,965.90 .1 D 112OTSH 1,930.87 35.03 – V

45 474027117115201 1,967.20 .1 D 112OTSH 1,931.21 35.99 – V

46 474019117114801 1,987.40 .1 D 112OTSH 1,932.02 55.38 – V

47 474040117114001 1,994.66 .1 D 112OTSH 1,938.12 56.54 – V

48 473945117115301 2,043.26 .1 D 112OTSH 1,934.55 108.71 – V

49 473953117141601 2,052.28 .1 D 112OTSH 1,921.84 130.44 T V

50 473945117130401 2,055.21 .1 D 112OTSH 1,928.65 126.56 – V

51 473954117152101 2,014.99 0.1 D 112OTSH 1,913.11 101.88 – T

52 473939117164401 2,002.15 .1 D 112OTSH 1,904.75 97.40 R V

53 473952117173401 1,967.28 .1 D 112OTSH 1,895.55 71.73 – V

54 473931117180101 1,966.08 .1 D 112OTSH 1,892.35 73.73 – V

55 473835117152001 2,084.73 .1 D 112OTSH 1,917.83 166.90 – V

56 473857117142201 2,026.06 .1 D 112OTSH 1,921.95 104.11 – V

57 473904117130902 2,017.12 .1 D 112OTSH 1,926.84 90.28 – V

58 473839117131101 2,082.59 .1 D 112OTSH 1,926.53 156.06 – V

59 473918117124201 2,019.93 .1 D unknown 1,929.50 90.43 – V

60 473852117115301 2,046.42 .1 D 112OTSH 1,931.19 115.23 – V

61 473831117125201 2,085.33 .1 D 112OTSH 1,926.92 158.41 – V

62 473805117122501 2,066.66 .1 D 112OTSH 1,927.45 139.21 R V

63 473813117141701 2,065.64 .1 D 112OTSH 1,920.64 145 – V

64 473800117135801 2,017.02 .1 D 112OTSH 1,921.90 95.12 R V

65 473747117151801 2,034.14 .1 D 112OTSH 1,919.14 115 – V

66 473742117142502 2,033.97 .1 D 112OTSH 1,922.17 111.80 – V

67 473728117143801 2,034.42 .1 D 112OTSH 1,921.42 113 R V

68 474144117031401 2,049.56 .1 D 112OTSH 1,969.11 80.45 – V

69 474159117034801 2,081.99 .1 D 112OTSH 1,967.79 114.20 – V

70 474136117043702 2,070.33 .1 D 112OTSH 1,965.13 105.20 – A

71 474140117060401 2,056.37 .1 D 112OTSH 1,961.55 94.82 – V

72 474145117060502 2,055.81 .1 D 112OTSH 1,957.11 98.70 – A

73 474115117060301 2,043.99 .1 D 112OTSH 1,961.50 82.49 – V

74 474110117060601 2,036.91 .1 D 112OTSH 1,961.84 75.07 – V

75 474156117072802 2,062.96 .1 D 112OTSH 1,956.96 106.00 – A

76 474150117080701 2,054.70 .1 D 112OTSH 1,956.73 97.97 – V

77 474156117091601 2,049.36 .1 D 112OTSH 1,953.77 95.59 – V

78 474116117080301 2,028.09 .1 D 112OTSH 1,954.77 73.32 – V

79 474109117091701 2,025.36 .1 D 112OTSH 1,951.84 73.52 – V

80 474046117091501 2,004.72 .1 D 112OTSH 1,951.07 53.65 – V

81 474038117091201 2,021.23 .1 D 112OTSH 1,951.19 70.04 – V

82 474037117091301 2,022.35 .1 D 112OTSH 1,950.93 71.42 – V

83 474050117064201 2,024.07 .1 D 112OTSH 1,959.62 64.45 – V

84 474106117060501 2,034.34 .1 D 112OTSH 1,990.20 44.14 – V

85 474107117060501 2,040.32 .1 D 112OTSH 1,983.27 57.05 – V

86 474107117060502 2,034.20 .1 D 112OTSH 1,961.20 73.00 – V

87 474033117062501 2,041.70 .1 D 112OTSH 1,959.70 82.00 – V

88 474032117044401 2,112.63 .1 D 112OTSH 1,962.23 150.40 – V

89 473944117045001 2,142.88 .1 D 112OTSH 1,965.88 177.00 V S

90 474010117060601 2,085.91 .1 D 112OTSH 1,959.59 126.32 – V

91 473925117053201 2,072.46 .1 D 112OTSH 1,950.70 121.76 P V

92 474011117072901 2,059.70 .01 L 112OTSH 1,955.20 104.50 – V

93 474016117085601 2,035.60 .5 D 112OTSH 1,948.11 87.49 – V

94 473928117083001 2,047.74 .1 D 112OTSH 1,951.43 96.31 – S

95 473929117092603 2,043.00 1.0 D 112OTSH 1,947.70 95.30 S A

96 473855117090602 2,104.67 .1 D 112OTSH 1,986.89 117.78 – V

97 474049117023501 2,178.13 .1 D 112OTSH 1,980.28 197.85 – S

98 474643117291401 1,705.24 .1 D 112OTSH 1,568.87 136.37 – V

99 474629117305101 1,729.00 10 M 112OTSH 1,556.19 172.81 – V

100 474623117320301 1,742.13 .1 D 112OTSH 1,545.21 196.92 – V

101 474619117303601 1,733.51 .1 D 112OTSH 1,576.41 157.10 – V

102 474551117273801 1,614.00 10 M 112OTSH 1,580.71 33.29 – A

103 474550117253001 1,714.00 1.0 L 112OTSH 1,611.20 102.80 – A

104 474427117312101 1,634.00 10 M 112OTSH 1,614.56 19.44 – V

105 474434117301301 1,680.19 .1 D 112OTSH 1,607.79 72.40 – V

106 474434117301201 1,680.00 10 M 112OTSH 1,606.16 73.84 – V

107 474434117303201 1,668.48 .1 D 112OTSH 1,607.92 60.56 – V

108 474334117284501 1,682.47 .1 D 122CBRV 1,613.88 68.59 – V

109 474323117292801 1,692.83 .1 D 112OTSH 1,619.13 73.70 – V

110 474302117294901 1,629.20 .1 D 112OTSH 1,611.03 18.17 – V

111 474213117293301 1,646.90 .1 D 112OTSH 1,631.47 15.43 – V

112 474623117220001 1,867.00 10 M 112OTSH 1,750.44 116.56 – V

113 474628117213201 1,895.32 .1 D 112OTSH 1,854.22 41.10 – A

114 474610117245401 1,818.89 .1 D 112OTSH 1,710.16 108.73 – V

115 474604117242901 1,788.03 .1 D 112OTSH 1,692.10 95.93 – V

116 474538117243601 1,774.67 .1 D 112OTSH 1,743.46 31.21 – V

117 474618117231501 1,825.39 .1 D 112OTSH 1,750.40 74.99 – V

118 474618117231601 1,825.39 .1 D 112OTSH 1,750.20 75.19 – V

119 474552117211801 1,905.61 .1 D 112OTSH 1,820.75 84.86 – V

120 474549117211401 1,905.61 .1 D 112OTSH 1,819.70 85.91 – V

121 474519117231001 1,942.02 .1 D 112OTSH 1,779.10 162.92 – V

122 474516117250801 1,924.00 20 M 112OTSH 1,761.44 162.56 – V

123 474436117245901 1,938.23 .1 D 112OTSH 1,799.57 138.66 – V

124 474437117243501 1,949.99 .1 D 112OTSH 1,790.89 159.10 – A

125 474418117231001 1,995.27 .1 D 112OTSH 1,810.36 184.91 – V

126 474355117221101 2,001.99 .1 D 112OTSH 1,813.41 188.58 – V

127 474352117215101 2,019.00 20 M 112OTSH 1,835.31 183.69 – V

128 474303117215901 2,034.00 10 M 112OTSH 1,846.28 187.72 – V

129 474307117204601 2,009.00 10 M unknown 1,861.61 147.39 – S

130 474326117244901 2,054.00 10 M 112OTSH 1,848.70 205.30 – C

131 474325117251701 2,048.66 .1 D 112OTSH 1,835.66 213 – V

132 474305117244401 2,079.00 20 M 112OTSH 1,844.54 234.46 – V

133 474242117244901 2,068.45 .1 D 112OTSH 1,847.02 221.43 – V

134 474216117244501 2,063.14 .1 D 112OTSH 1,854.75 208.39 – V

135 474619117040801 2,160.42 .1 D 210CRCS 2,054.45 105.97 – V

136 474419117033901 2,186.00 .1 L 112OTSH 1,978.19 207.81 – V

137 474349117025201 2,107.97 .1 D 112OTSH 1,976.80 131.17 – V

138 474304117025201 2,084.17 .1 D 112OTSH 1,975.11 109.06 – V

139 474226117024801 2,094.02 .1 D 112OTSH 1,973.84 120.18 – V

140 474226116444101 2,220.91 .1 D 112OTSH 2,086.12 134.79 – S

141 474213116450601 2,219.55 .1 D 400PRCD 2,057.47 162.08 – V

142 474208116465001 2,242.01 .1 D 112OTSH 2,051.95 190.06 – V

143 474229116474501 2,224.00 10 M 112OTSH 2,019.50 204.50 – V

144 474229116490301 2,204.00 20 M 112OTSH 2,021.52 182.48 – V

145 474221116513801 2,179.18 .01 L 112OTSH 2,019.20 159.98 – V

146 474142116470101 2,227.11 .1 D 112OTSH 2,056.68 170.43 – V

147 474134116470001 2,226.35 .1 D 112OTSH 2,057.50 168.85 – V

148 474115116470101 2,224.43 .01 L 112OTSH 2,058.68 165.75 – V

149 474043116460201 2,184.81 .1 D 112OTSH 2,064.89 119.92 – V

150 474242116540301 2,197.43 .1 D 112OTSH 2,001.54 195.89 – S

151 474230116544901 2,197.90 .01 L 112OTSH 2,003.80 194.10 R V

152 474232116582001 2,144.00 20 M 112OTSH 2,005.90 138.10 – V

153 474223116582501 2,111.00 20 M 112OTSH 2,008.10 102.90 – V

154 474209117003401 2,114.49 .1 D 112OTSH 1,983.69 130.80 – V

155 474145117000701 2,068.83 .1 D 112OTSH 1,981.67 87.16 – S

156 474156117011501 2,092.05 .01 L unknown 1,980.89 111.16 – S

157 474134117002201 2,073.32 .1 D 112OTSH 2,008.95 64.37 – V

158 474134117002202 2,073.54 .1 D 112OTSH 2,038.01 35.53 – V

159 474147116544001 2,134.00 20 M 112OTSH 2,019.43 114.57 R S

160 474208117012301 2,114.65 .01 L 112OTSH 1,978.67 135.98 – V

161 474130117015401 2,073.29 .1 D 112OTSH 1,978.89 94.40 – V

162 474529116452601 2,296.77 .01 L 112OTSH 2,149.37 147.40 – V

163 474718116481701 2,321.00 5.0 D 112OTSH 2,007.00 314.00 – G

164 474757116492701 2,311.77 .1 D 112OTSH 2,006.69 305.08 – V

165 474732116521701 2,275.35 .1 D 112OTSH 2,004.74 270.61 – V

166 474755116521901 2,246.56 .1 D 112OTSH 2,004.26 242.30 R V

167 474720116532101 2,240.47 .1 D 112OTSH 2,004.07 236.40 – V

168 474659116511901 2,275.20 .01 L 112OTSH 2,005.57 269.63 V S

169 474704116495001 2,300.31 .01 L 112OTSH 2,004.66 295.65 V S

170 474714116471301 2,314.00 5 M 112OTSH 2,008.76 305.24 – V

Map

identification No.

Well-site

identification No.

Altitude 

of land 

surface

(in feet

above 

NAVD 88)

Accuracy

of landsurface

altitude

(feet)

Method 

used to 

derive landsurface 

altitude

Aquifer 

unit in 

which well 

completed

Water

level 

(in feet

above 

NAVD 88)

Depth of 

water 

(in feet

below land 

surface)

Well 

status

Method 

of waterlevel 

measurement

171 474643116461901 2,308.78 1.0 D 122CBRV 2,112.89 195.89 – S

172 474542116485701 2,302.16 .1 D 112OTSH 2,004.52 297.64 S V

173 474547116501701 2,279.85 .1 D 112OTSH 2,003.25 276.60 V S

174 474547116524801 2,255.78 .01 L 112OTSH 2,003.07 252.71 V S

175 474512116525801 2,238.04 .1 D 112OTSH 2,001.44 236.60 V S

176 474444116525701 2,253.18 .1 D 112OTSH 2,001.04 252.14 V S

177 474443116525701 2,252.61 .1 D 112OTSH 2,001.16 251.45 R V

178 474445116521601 2,249.18 .1 D 112OTSH 2,001.82 247.36 – S

179 474529116474001 2,290.26 .1 D 112OTSH 2,010.66 279.60 – S

180 474453116474501 2,277.94 .1 D 112OTSH 2,013.56 264.38 – V

181 474417116475001 2,278.06 .1 D 112OTSH 2,012.56 265.50 – V

182 474437116494801 2,283.81 .1 D 112OTSH 2,003.03 280.78 – V

183 474337116533201 2,211.51 .1 D 112OTSH 2,000.63 210.88 – V

184 474308116522101 2,346.70 .01 L 112OTSH 1,997.52 349.18 V S

185 474259116521201 2,301.33 .1 D 112OTSH 2,001.68 299.65 – S

186 474306116493601 2,257.49 .1 D 112OTSH 2,013.86 243.63 – V

187 474309116471601 2,239.95 .1 D Multiple 2,037.38 202.57 – V

188 474808116534001 2,203.41 .1 D 112OTSH 1,999.48 203.93 – V

189 474733116560801 2,184.00 20 M 210CRCS 2,021.50 162.50 P V

190 474718116562201 2,151.13 .1 D 112OTSH 2,002.94 148.19 – V

191 474718116545901 2,178.93 .1 D 112OTSH 2,001.03 177.90 – V

192 474601116551301 2,221.78 .01 L 112OTSH 1,999.12 222.66 – S

193 474618116583501 2,166.90 .1 D 210CRCS 2,107.60 59.30 – V

194 474617116584101 2,165.00 20 D 210CRCS 2,032.85 132.15 – V

195 474559116574901 2,144.77 .1 D 112OTSH 1,994.21 150.56 V S

196 474603117010301 2,204.00 20 M 112OTSH 2,142.02 61.98 – V

197 474450117003301 2,126.80 .1 D 112OTSH 1,988.06 138.74 R V

198 474458116583701 2,146.45 .1 D 112OTSH 1,987.70 158.75 – S

199 474532116572701 2,166.68 .1 D 112OTSH 2,014.03 152.65 S A

200 474533116535601 2,239.99 .1 D unknown 2,001.98 238.01 – S

201 474520116543701 2,220.75 .1 D 112OTSH 2,000.98 219.77 V S

202 474440116545801 2,232.79 .01 L 112OTSH 1,997.11 235.68 – S

203 474439116572601 2,146.98 0.01 L 112OTSH 1,993.93 153.05 – V

204 474353116565101 2,240.64 1 D 112OTSH 2,005.29 235.35 – V

205 474352116565201 2,240.64 1.0 D 112OTSH 2,004.72 235.92 – V

206 474407116573301 2,157.24 .1 D 112OTSH 2,007.29 149.95 – A

207 474355117012201 2,114.00 5.0 M 112OTSH 1,983.28 130.72 – V

208 474329117011601 2,109.26 .01 L 112OTSH 1,982.54 126.72 – V

209 474329116582801 2,145.42 .01 L 112OTSH 1,989.18 156.24 – S

210 474337116564801 2,217.47 .01 L 112OTSH 1,992.95 224.52 – V

211 474318116553401 2,192.75 .01 L 112OTSH 1,996.10 196.65 – V

212 474309117012301 2,103.17 .01 L 112OTSH 1,981.93 121.24 – S

213 475211116443801 2,313.98 .1 D 112OTSH 2,226.59 87.39 – V

214 475132116451501 2,304.09 .1 D 210CRCS 2,207.61 96.48 – V

215 475237116480601 2,346.18 .1 D Multiple 1,994.89 351.29 – S

216 475317116510301 2,444.00 10 M 112OTSH 2,010.05 433.95 – S

217 475322116522201 2,416.00 10 M 112OTSH 2,017.64 398.36 – S

218 475221116502201 2,364.00 10 M 112OTSH 2,014.21 349.79 – V

219 475202116484301 2,311.71 .1 D 112OTSH 2,010.30 301.41 – S

220 475110116474201 2,296.41 .1 D 112OTSH 2,115.34 181.07 – S

221 475121116491801 2,321.69 .1 D Multiple 2,010.33 311.36 – V

222 475110116515701 2,326.67 .1 D 112OTSH 2,009.98 316.69 – V

223 475002116521101 2,270.56 .05 L Multiple 2,043.33 227.23 – V

224 475036116502001 2,289.00 5.0 M 112OTSH 2,001.74 287.26 – V

225 475019116494701 2,284.41 .1 D 112OTSH 2,009.39 275.02 – S

226 475030116461401 2,300.80 .1 D 112OTSH 2,053.31 247.49 – V

227 475025116462301 2,305.04 0.1 D 112OTSH 2,051.14 253.90 – V

228 474953116470801 2,288.09 .1 D 112OTSH 2,010.44 277.65 – V

229 474906116484801 2,263.85 2.5 D 112OTSH 2,000.67 263.18 R S

230 474823116511601 2,264.00 5.0 M 112OTSH 2,010.09 253.91 – V

231 474829116484801 2,313.25 .1 D 112OTSH 2,007.35 305.90 – V

232 474847116474701 2,314.52 .1 D 112OTSH 2,006.07 308.45 – V

233 475816116353301 2,293.89 .01 L 112OTSH 2,058.19 235.70 – V

234 475705116371201 2,441.61 .1 D 112OTSH 2,057.16 384.45 – S

235 475659116370701 2,457.82 .1 D 112OTSH 2,057.31 400.51 – V

236 475736116341701 2,294.83 .1 D 112OTSH 2,062.22 232.61 – S

237 475752116384801 2,440.55 5 D 112OTSH 2,050.69 389.86 – V

238 475838116412101 2,407.26 .1 D 112OTSH 2,051.51 355.75 – S

239 475750116403801 2,374.00 10 M 112OTSH 2,055.72 318.28 – S

240 475747116435101 2,516.16 .1 D 112OTSH 2,040.33 475.83 – V

241 475756116444101 2,508.72 .1 D 112OTSH 2,035.86 472.86 – V

242 475655116445801 2,490.50 .1 D 112OTSH 2,039.45 451.05 – V

243 475717116391601 2,454.09 .1 D 112OTSH 2,053.63 400.46 – V

244 475627116454501 2,491.44 .01 L 112OTSH 2,024.20 467.24 – V

245 475510116391201 2,457.37 .1 D 112OTSH 2,177.93 279.44 – S

246 475400116404201 2,460.25 .1 D 112OTSH 2,237.99 222.26 – S

247 475754116523502 2,457.92 .01 L 112OTSH 2,163.92 294.00 – V

248 475656116520401 2,548.30 .1 D 112OTSH 2,095.94 452.36 R S

249 475622116470101 2,505.01 .1 D 112OTSH 2,029.02 475.99 – S

250 475416116462401 2,416.33 .1 D 112OTSH 2,022.78 393.55 – V

251 475439116503401 2,432.26 0.1 D 112OTSH 2,019.41 412.85 – S

252 480128116375301 2,320.43 .1 D 112OTSH 2,277.68 42.75 – V

253 480046116373601 2,344.00 10 M 112OTSH 2,232.46 111.54 – V

254 480046116373401 2,341.49 .1 D 112OTSH 2,231.79 109.70 – V

255 475935116361901 2,359.01 .1 D 210CRCS 2,288.03 70.98 – V

256 480140116384301 2,283.12 .1 D 112OTSH 2,265.13 17.99 R V

257 480137116383901 2,287.70 .1 D 112OTSH 2,266.37 21.33 – V

258 475935116405001 2,177.63 .1 D 112OTSH 2,108.56 69.07 – V

259 475852116435501 2,338.50 .1 D 112OTSH 2,082.76 255.74 – V

260 480300116492401 2,233.50 .1 D 112OTSH 2,148.52 84.98 R S

261 480209116484201 2,184.21 .1 D 112OTSH 2,147.45 36.76 – V

262 480051116532101 2,303.53 .1 D 112OTSH 2,158.17 145.36 – S

263 480015116512901 2,429.00 5 M 112OTSH 2,148.31 280.69 – V

264 480021116531201 2,401.34 .1 D 112OTSH 2,044.18 357.16 – V

265 475913116531101 2,346.90 .1 D 112OTSH 2,132.16 214.74 – V

266 475849116521601 2,577.18 .1 D 112OTSH 2,035.78 541.40 – V

267 480101116563601 2,317.17 .1 D 112OTSH 2,172.19 144.98 – S

WASHINGTON

IDAHO

Study area

Hauser

Lake Newman

 Lake

Liberty

Lake

Spirit Lake

Blanchard

Lake

Twin

Lakes

Fernan

Lake

Coeur d’ Alene

Lake

Hayden Lake

SPOKANE

RIVER

SPOKANE

Hangman

(Latah) Creek

Lake

Little Spokane

River

Deadman

Creek

Th

ompson

Fish Creek

Brickel

Creek

Cougar

Creek

Long

Lake Pend Oreille

Hoodoo

Lake

RIVER

Nine

Mile

Rese

rvoir

Cr

ee

k

SPOKANE

Seven

Mile

Nine Mile Falls

Parkwater

Dishman

Opportunity

Pasadena

Park

Trentwood

Greenacres

Otis Orchards

Post Falls

Huetter

Dalton Gardens

Coeur d’Alene

Clarksville

Hayden Lake

Rathdrum

Spirit Lake

Bayview

Careywood

Athol

W A S H I N G T O N

I D A H O

Spokane County

Kootenai County

Bonner County

Five Mile

Prairie

Trinity Trough

Chilco Channel

West (Main) Channel

Middle (Ramsey) Channel

Hoodoo Valley

Hillyard Trough

Rathdrum Prairie

FARRAGUT

STATE PARK

Harlem

Clagstone

Blanchard

Edgemere

Spirit Valley

ROUND

MOUNTAIN

Base from U.S. Geological Survey digital data, l:500,000, 1983

Universal Transverse Mercator Projection, Zone 11

1:125 000

0 2 4 6 8 10 12 MILES

0 2 4 6 8 10 12 14 16 18 KILOMETERS

1540

1560

1580

1600

1720

1700

1680

1660

1640

1620

1740

1760

1780

1820

1800

1620

1600

1680

1660

1640

1720

1700

1740

1760

1780

1800

1860

1840

1820

1880

1900

1920

1940

1960

1980

1980 2000

2020

2040

2060

2100

2140

2100 2060 2040

2020

2000

2000

2020

2040

2060

2100

2140

2020

2060

2100

2140

2180

2220

2060

2020

2040

2060

2100

2140

2180

2220

2180

2100

2140

2180

2220

2260

2260

2220

2180

2100

2060

2140

2100

2040

9

8

7

6

5

4

3 2

1

0

99 98

97

96

95 94

93

92

91

90 89

88

87

86

84 85

82 83

81

80

79

78

77 76 75 72

71 70

69

68

67

65

63 64 62

61

60

59

58

57

56 55

54

53

52

51 50

49

48

47

46

45

44

43

42

41

40

39

38

37 36

35

34

33

32

31

30

29

27

26

25

23 24

22 21

20

19

18

17

15

14

13

12 11

10

267

266

265

264

263

262

261

260

259

258

257

256

255

254

253

252

251 250

249

248

247

246

245

244

243

242

241

240 239

238

237

236

235

234

233

232

231 230

229

228

227

226 225

224

223

222

221

220

219 218

217

216

215

214

213

212

209 210 208

207

206 205

204

203 202

201

200

199

198

197

196 195

194

193 192

190 191

188

186 187

185

184

183

182

181

180

179

178 177

176

175

174 173

172

171

170

169 168

167

166

165

164

163

162

161

160

159

158

157

156

154 153

152 151

150

149

148

147

146

145

144

143 142

141

139

138

137

136

135

134

133

132

131

130

129

128

127

126

125

124

123

122

121

120

111

109

108

107

104 105 106

103

102

101 100

73 74

66

28

16

189

155

140

114 115

116

117

118

112

113

119

110

211

2051

2126

2236

2061

2436

2316

2190

2129

47°40’

47°50’

48°

117°30’ 117°20’ 117°10’

117° 116°50’ 116°40’

R. 42 E. R. 43 E. R. 44 E. R. 45 E. R. 6 W. R. 4 W. 

R. 3 W. 

R. 2 W. 

R. 1 W. 

R. 41 E. R. 5 W. 

T.

25

N.

T.

26

N.

T.

27

N.

T.

49

N.

T.

50

N.

T.

51

N.

T.

52

N.

T.

53

N.

T.

54

N.

T.

55

N.

 EXPLANATION

WATER-LEVEL CONTOUR — Shows altitude

at which water level would stand in

tightly cased wells, September 2004.

Contour interval, in feet, is variable.

Datum is Mean Sea Level

LAKE-STAGE ELEVATION, IN FEET ABOVE 

MEAN SEA LEVEL

BOUNDARY OF STUDY AREA

WELL AND MAP IDENTIFICATION NO.

2020

2126

146