Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

GEM

BOISE

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

M O N TA N A

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

4

2 1

5

6

8

7 9

3

EXPLANATION

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum 1983, Vertical datum: North 

American Vertical Datum 1988.

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Structural regions—PLATE 1 of 9

Modified from Reidel and others (2002)

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Structural Regions of the Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Columbia Plateau Regional

Aquifer System

Yakima Fold Belt

Palouse Slope

Blue Mountains

Clearwater Embayment

Columbia Plateau Regional Aquifer System

Location and map number for wells with 

hydrographs in figure 1

Structural regions of the Columbia Plateau 

Regional Aquifer System

1

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

Extent of Overburden unit

Columbia Plateau Regional Aquifer System

Measured by U.S. Geological Survey

Measured by other agencies

Well with spring 2009 water-level measurement 

in the Overburden unit 

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Wells and groundwater levels for the Overburden unit—PLATE 2 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Locations of Wells and Estimated Groundwater Levels for the Overburden Unit, 

Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, Spring 2009

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

Estimated groundwater elevation

Insufficient data

Columbia Plateau Regional Aquifer System

Extent of Saddle Mountains unit

Lowest Highest

Well with Spring 2009 water-level measurement 

in the Saddle Mountains unit 

Generalized groundwater flow direction

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Wells and groundwater levels for the Saddle Mountains unit—PLATE 3 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Locations of Wells and Estimated Groundwater Levels for the Saddle Mountains Unit,

Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, Spring 2009

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Measured by U.S. Geological Survey

Measured by other agencies

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

Estimated groundwater elevation

Columbia Plateau Regional Aquifer System

Extent of Wanapum unit

Lowest Highest

Well with spring 2009 water-level measurement 

in the Wanapum unit 

Generalized groundwater flow direction

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Wells and groundwater levels for the Wanapum unit—PLATE 4 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Locations of Wells and Estimated Groundwater Levels for the Wanapum Unit,

Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, Spring 2009

Insufficient data

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Measured by U.S. Geological Survey

Measured by other agencies

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

M O N T .

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

Estimated groundwater elevation

Columbia Plateau Regional Aquifer System

Extent of Grande Ronde unit

Lowest Highest

Well with spring 2009 water-level measurement 

in the Grande Ronde unit 

Generalized groundwater flow direction

Insufficient data

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Wells and groundwater levels for the Grande Ronde unit—PLATE 5 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Locations of Wells and Estimated Groundwater Levels for the Grande Ronde Unit,

Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, Spring 2009

Measured by U.S. Geological Survey

Measured by other agencies

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Groundwater level changes for the Overburden unit—PLATE 6 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Groundwater-Level Changes for the Overburden Unit, Columbia Plateau Regional Aquifer System,

Washington, Oregon, and Idaho, Spring 1984 to Spring 2009

Water-level change in the Overburden unit for spring 

1984 to spring 2009—in feet. The contributing unit is

greater than 75 percent of open interval.

Extent of Overburden unit

Columbia Plateau Regional Aquifer System

0

20

40

60

80

100

Water-level change 1984–2009, in feet

Number of wells

GROUNDWATER

DECLINE

GROUNDWATER

RISE

 25 to 45

 5 to 25

 -5 to 5

 -25 to -5

 -100 to -25

 -147 to -100 Groundwater decline

Groundwater rise

-147 to -100

-100 to -25

-25 to -5

-5 to 5

5 to 25

25 to 45

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Groundwater level changes for the Saddle Mountains unit—PLATE 7 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Groundwater-Level Changes for the Saddle Mountains Unit, Columbia Plateau Regional Aquifer System,

Washington, Oregon, and Idaho, Spring 1984 to Spring 2009

Water-level change in the Saddle Mountains unit for 

spring 1984 to spring 2009—in feet. The 

contributing unit is greater than 75 percent of 

open interval.

Extent of Saddle Mountains unit

Columbia Plateau Regional Aquifer System

0

20

40

60

80

100

Water-level change 1984–2009, in feet

Number of wells

GROUNDWATER

DECLINE

GROUNDWATER

RISE

Groundwater decline

Groundwater rise

-244 to -100

-100 to -25

-25 to -5

-5 to 5

5 to 25

25 to 78

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

 25 to 78

 5 to 25

 -5 to 5

 -25 to -5

 -100 to -25

 -244 to -100

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Groundwater level changes for the Wanapum unit—PLATE 8 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Groundwater-Level Changes for the Wanapum Unit, Columbia Plateau Regional Aquifer System,

Washington, Oregon, and Idaho, Spring 1984 to Spring 2009

Water-level change in the Wanapum unit for spring 

1984 to spring 2009—in feet. The contributing unit 

is greater than 75 percent of open interval.

Extent of Wanapum unit

Columbia Plateau Regional Aquifer System

0

20

40

60

80

100

Water-level change 1984–2009, in feet

Number of wells

GROUNDWATER

DECLINE

GROUNDWATER

RISE

 25 to 95

 5 to 25

 -5 to 5

 -25 to -5

 -100 to -25

 -249 to -100 Groundwater decline

Groundwater rise

-249 to -100

-100 to -25

-25 to -5

-5 to 5

5 to 25

25 to 95

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

Study area
Ellensburg

Walla

Walla

Yakima

Pasco

Kennewick

Lewiston

Moscow

Spokane

The

Dalles

La Grande

Pullman

Wenatchee

Moses

Lake

Coeur

d'Alene

Pendleton

Hermiston

Heppner

Umatilla

Milton-Freewater

SNOHOMISH

SKAGIT

KING

PIERCE

LEWIS

CHELAN

OKANOGAN

KITTITAS

YAKIMA

SKAMANIA

KLICKITAT

HOOD

RIVER

CLACKAMAS

MARION

LINN

FERRY STEVENS

PEND

ORIELLE

BENTON

GRANT

LINCOLN

SPOKANE

ADAMS

FRANKLIN

WALLA WALLA

WHITMAN

COLUMBIA

GARFIELD

ASOTIN

SHERMAN

JEFFERSON

DESCHUTES

CROOK

GILLIAM

MORROW

WHEELER

MALHEUR

BAKER

WALLOWA

BONNER

KOOTENAI

BENEWAH

LATAH

CLEARWATER

NEZ PERCE

WASHINGTON

VALLEY

ADAMS

IDAHO

DOUGLAS

WASCO

GRANT

UNION

SHOSHONE

LEWIS

UMATILLA

O R E G O N

I D A H O

WA S H I N G T O N

SNAKE

RIVER

Crab

Spokane

Creek

River

Palouse

River

COLUMBIA

RIVER

Toppenish Creek

Yakima

Naches

Klickitat R

Umatilla

Banks

Lake

Lake

Chelan Lake

Pend

Oreille

Moses

Lake

Priest

Rapids

Lake

Coulee

Moses

Walla Walla River

Ford

Cr

Clearwater

River

Satus Creek

Hangman

Creek

River

River

River

River River

River

River

RIVER

Imnaha

Salmon

Grande

SNAKE

Ronde

John Day River

John Day

River

Deschutes

Lake

Billy

Chinook

Lower Crab Cr

Pend

Ore ille River

Coeur

d'Alene

Lake

F. D. Roosevelt Lake

COLUMBIA RIVER

N Fk John Day River

GEM

BOISE

M O N TA N A

EXPLANATION

0 20 40 60 80 100 MILES

0 20 40 60 80 100 KILOMETERS

116°00'

116°00'

117°00'

117°00'

118°00'

118°00'

119°00'

119°00'

120°00'

120°00'

121°00'

121°00'

122°00'

122°00'

48°

00'

47°

00'

46°

00'

45°

00'

48°

00'

47°

00'

46°

00'

45°

00'

By

Daniel T. Snyder and Jonathan V. Haynes

2010

U.S. DEPARTMENT OF THE INTERIOR

U.S. GEOLOGICAL SURVEY

 Scientific Investigations Report 2010-5040

Groundwater level changes for the Grande Ronde unit—PLATE 9 of 9

Snyder, D.T., and Haynes, J.V., 2010, Groundwater Conditions During 2009 and Changes in Groundwater 

Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Groundwater-Level Changes for the Grande Ronde Unit, Columbia Plateau Regional Aquifer System,

Washington, Oregon, and Idaho, Spring 1984 to Spring 2009

Water-level change in the Grande Ronde unit for 

spring 1984 to spring 2009—in feet. The 

contributing unit is greater than 75 percent of 

open interval.

Extent of Grande Ronde unit

Columbia Plateau Regional Aquifer System

0

20

40

60

80

100

Water-level change 1984–2009, in feet

Number of wells

GROUNDWATER

DECLINE

GROUNDWATER

RISE

Groundwater decline

Groundwater rise

-298 to -100

-100 to -25

-25 to -5

-5 to 5

5 to 25

25 to 92

Digital data: U.S. Geological Survey, various scales. Projection: State Plane, Washington, South, FIPS 

4602: Projection: Lambert Conformal Conic; False easting: 1640416.666667; False northing: 0.000000; 

Central meridian: -120.500000; Standard parallel 1: 45.833333; Standard parallel 2: 47.333333; 

Latitude of origin: 45.333333; Horizontal datum: North American Datum1983, Vertical datum: North 

American Vertical Datum 1988.

Columbia Plateau Regional

Aquifer System

WASHINGTON

OREGON

MONTANA

IDAHO

Columbia R.

Snake R

 25 to 92

 5 to 25

 -5 to 5

 -25 to -5

 -100 to -25

 -298 to -100

Study area