0 5 10 15 20 25 30 35 MILES

0 5 10 15 20 25 30 35 40 45 50 55 KILOMETERS

SCALE 1:500 000

0 5 10 15 20 25 30 35 MILES

0 5 10 15 20 25 30 35 40 45 50 55 KILOMETERS

SCALE 1:500 000

0 5 10 15 20 25 30 35 MILES

0 5 10 15 20 25 30 35 40 45 50 55 KILOMETERS

SCALE 1:500 000

0 5 10 15 20 25 30 35 MILES

0 5 10 15 20 25 30 35 40 45 50 55 KILOMETERS

SCALE 1:500 000

Bedrock Units

Paleozoic metamorphics

Mesozoic metamorphics

Mesozoic volcanics

Mesozoic plutonics

Tertiary sediments

Tertiary volcanics

Tertiary plutonics

Quaternary sediments

Quaternary volcanics

Pmm

Mmm

Mvc

Mpl

Tsd

Tvc 

Tpl 

Qsd

Qvc

Extent of bedrock units exposed at surface

EXPLANATION

4,000 to 5,000

3,000 to 4,000

2,000 to 3,000

1,000 to 2,000

0 to 1,000

Between -1,000 and 0

EXPLANATION

Altitude of the top of the

 Saddle Mountains unit, in feet

Saddle Mountains Unit

5,000 to 6,000

4,000 to 5,000

3,000 to 4,000

2,000 to 3,000

1,000 to 2,000

0 to 1,000

Less than -1,000

EXPLANATION

Altitude of the top of the

 Wanapum unit, in feet

Wanapum Unit

-1,000 to 0

5,000 to 6,000

4,000 to 5,000

3,000 to 4,000

2,000 to 3,000

1,000 to 2,000

0 to 1,000

-2,000 to -1,000

6,000 to 7,000

Less than -2,000

EXPLANATION

Altitude of the top of the

 Grande Ronde unit, in feet

Grande Ronde Unit

-1,000 to 0

Kiona

Naches

Yakima

Wapato

Prosser

Richland

Sunnyside

Union Gap

Toppenish

Ellensburg

Cle Elum

Kiona

Naches

Yakima

Wapato

Prosser

Richland

Sunnyside

Union Gap

Toppenish

Ellensburg

Cle Elum

Kiona

Naches

Yakima

Wapato

Prosser

Richland

Sunnyside

Union Gap

Toppenish

Ellensburg

Cle Elum

Kiona

Naches

Yakima

Wapato

Prosser

Richland

Sunnyside

Union Gap

Toppenish

Ellensburg

Cle Elum

Mabton Mabton

Mabton Mabton

Granger Granger

Granger Granger

WASHINGTON

EXTENDED

STUDY

AREA

Extent of surficial bedrock units and altitude of top of basalt units—PLATE 2

SCIENTIFIC INVESTIGATIONS REPORT 2009–5152

Vaccaro, J.J., Jones, M.A., Ely, D.M., Keys, M.E., Olsen, T.D., Welch, W.B., and Cox, S.E., 2009, 

Hydrogeologic Framework of the Yakima River Basin Aquifer System, Washington

Prepared in cooperation with the

U.S. DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION, WASHINGTON STATE DEPARTMENT OF ECOLOGY, AND THE YAKAMA NATION

U.S. GEOLOGICAL SURVEY

science for a changing world

T.

10

N.

T.

8

N.

T.

6

N.

T.

12

N.

T.

14

N.

T.

16

N.

T.

18

N.

T.

20

N.

T.

22

N.

T.

24

N.

By

J.J. Vaccaro, M.A. Jones, D.M. Ely, M.E. Keys, T.D. Olsen, W.B. Welch, and S.E. Cox

2009

Base from U.S. Geological Survey and/or

Washington Division of Geology and Earth Resources

digital data, 1983, 1:100,000

Universal Transverse Mercator projection, Zone 10

Horizontal Datum: North American Datum of 1927 (NAD 27)

Vertical Datum: North American Vertical Datum of 1988 (NAVD 88)

47°00’

47°30’

121°30’ 121°00’ 120°30’ 120°00’ 119°30’

46°30’

46°00’

R. 10 E. R. 12 E. R. 14 E. R. 16 E. R. 18 E. R. 20 E. R. 22 E. R. 24 E. R. 26 E. R. 28 E.

T.

10

N.

T.

8

N.

T.

6

N.

T.

12

N.

T.

14

N.

T.

16

N.

T.

18

N.

T.

20

N.

T.

22

N.

T.

24

N.

47°00’

47°30’

121°30’ 121°00’ 120°30’ 120°00’ 119°30’

46°30’

46°00’

R. 10 E. R. 12 E. R. 14 E. R. 16 E. R. 18 E. R. 20 E. R. 22 E. R. 24 E. R. 26 E. R. 28 E.

T.

10

N.

T.

8

N.

T.

6

N.

T.

12

N.

T.

14

N.

T.

16

N.

T.

18

N.

T.

20

N.

T.

22

N.

T.

24

N.

47°00’

47°30’

121°30’ 121°00’ 120°30’ 120°00’ 119°30’

46°30’

46°00’

R. 10 E. R. 12 E. R. 14 E. R. 16 E. R. 18 E. R. 20 E. R. 22 E. R. 24 E. R. 26 E. R. 28 E.

T.

10

N.

T.

8

N.

T.

6

N.

T.

12

N.

T.

14

N.

T.

16

N.

T.

18

N.

T.

20

N.

T.

22

N.

T.

24

N.

47°00’

47°30’

121°30’ 121°00’ 120°30’ 120°00’ 119°30’

46°30’

46°00’

R. 10 E. R. 12 E. R. 14 E. R. 16 E. R. 18 E. R. 20 E. R. 22 E. R. 24 E. R. 26 E. R. 28 E.

Maps Showing Surficial Extent of Bedrock Hydrogeologic Units, and Extent and Altitude of the Top of the

Columbia River Basalt Group Hydrogeologic Units, Yakima River Basin Aquifer System, Washington

Bumping

Lake

Bumping River

Ahtanum Creek

Tieton River

Dry Creek

RIVER

YAKIMA

Cle

Elum

Lake

Rimrock

Lake

Kachess

Lake

Keechelus

Lake

Teanaway

River

Little Naches River

River

Naches

RIVER

YAKIMA

RIVER

YAKIMA

Cle Elum River

Bumping

Lake

Bumping River

Ahtanum Creek

Tieton River

Dry Creek

RIVER

YAKIMA

Cle

Elum

Lake

Rimrock

Lake

Kachess

Lake

Keechelus

Lake

Teanaway

River

Little Naches River

River

Naches

RIVER

YAKIMA

RIVER

YAKIMA

Cle Elum River

Bumping

Lake

Bumping River

Ahtanum Creek

Tieton River

Dry Creek

RIVER

YAKIMA

Cle

Elum

Lake

Rimrock

Lake

Kachess

Lake

Keechelus

Lake

Teanaway

River

Little Naches River

River

Naches

RIVER

YAKIMA

RIVER

YAKIMA

Cle Elum River

Bumping

Lake

Bumping River

Ahtanum Creek

Tieton River

Dry Creek

RIVER

YAKIMA

Cle

Elum

Lake

Rimrock

Lake

Kachess

Lake

Keechelus

Lake

Teanaway

River

Little Naches River

River

Naches

RIVER

YAKIMA

RIVER

YAKIMA

Cle Elum River