DIVISION OF GEOLOGY AND EARTH RESOURCES Geologic Map and Geothermal Assessment of the Wind River Valley, Skamania County, Washington Plate 1

USFS Procurement #: AG-046W-P-11-0108 and U.S. Department of Energy Grant #: DE-EE0002850 October, 2013 Geologic Map and Geothermal Assessment of the Wind River Valley, Qs 15 Qs 14 Skamania County, Washington EOvc Qvbih o EOvco OMi

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WRV-1 OMi OMidp Jessica L. Czajkowski, Jeffrey D. Bowman, Logan A. Fusso, and Darrick E. Boschmann OMi 76 D' OMi Big Butte

56 Qs October 2013 84

OMi 25 Mvb EOvc Qs G19 EOvco o 13 15 3 9 G21 75 85 4 41 OMigb OMid 47 57 70 40 75 G20 OMi 83 OMid Qs 64 4 Mvb 20 Qs 45 D EOvco

OMi EOvco D D' Qs 85 SOUTHWEST NORTHEAST EOvco 25 BIG BUTTE 20 3500 3500

Qs 55 3000 3000 Qs 14 Qs 79 2500 EOvco 2500 Qs OMidp OMi Qs 59 OMi Qs OMid 2000 2000 68 EOvc 12 OMi o

20 Elevation(feet) Elevation(feet) EOvco OMid 1500 EOvc 1500 OMi o OMi EOvco Qs River Wind WW-427281 (proj.ft to NW)1411 1000 1000 16 OMid 87 52 500 22 OMid 500 22 14 74 81 25 2x vertical exaggeration Trout Creek 52 EOvco Qs 45 84 OMi Hill Qvbtch 60 C' 54 18 G22 G4 DESCRIPTION OF MAP UNITS OMi OMi EOvco Qs Unconsolidated sediment (–)—Locally 19 G23 derived sediment ranging from clay to boulders; consists of 80 talus, alluvium, alluvial fans, colluvium, rockfall, and landslide Warren 17 OMi C C' deposits; only noted where deposits obscure bedrock identification 86 NORTHEAST or observation. Ridge 20 SOUTHWEST

EOvc 29 3000 3000 o OMid Volcanic Rocks WARREN RIDGE 70 BUNKER HILL OMi 68 2500 2500 OMi Qs OMi Qvbtch of Trout Creek Hill (Pleistocene)—Unweathered, dark gray, 5 2000 OMi 2000 vesicular, porphyritic basalt with abundant and labradorite G5 EOvc phenocrysts in an aphanitic matrix of basaltic composition; flowed o 19 87 southeastward from Trout Creek Hill and down Wind River Bunker 79 OMi valley to the . 1500 OMi 1500 Hill 62 88 Qs 82 Qs Qs EOvco Elevation(feet) EOvc Elevation(feet) 42 OMigb OMid OMigb o

33 River Wind OMid G6 Qvb Qs Basalt of Indian Heaven (Quaternary)—Blackish gray 39 1000 tch OMi 1000 Qvbih 81 59 G7 16 56 to grayish black, highly vesicular, porphyritic basalt with abundant EOvco G3 80 plagioclase phenocrysts; Concealed beneath upper Wind River 84 85 EOvco 30 62 EOvco alluvium upstream from U.S. Forest Service Fish Hatchery. OMigb 68 78 500 500 Qs DNR 89 46 EOvc 85-7C o 0 Intrusive Rocks DNR-TRCK 65 0 2x vertical exaggeration 88 Quartz diorite porphyry of Wind Mountain (Pliocene)—Light 18 PLqdw 85 grey, porphyritic pyroxene quartz diorite forming Wind Mountain. G8 C OMid –Oligocene Volcanic Rocks B' EOvco B 87 EOvco NORTHWEST SOUTHEAST Mvb Basalt and (Miocene)—Dark grayish black to 78 Pilot Knob 18 80 1500 1500 dark blackish gray, seriate to porphyritic basalt to 9 Qs basaltic andesite. 79 SHIPERDS ZONE G9 82 EOvc 20 o BEAR CREEK FAULT A–A' OMi 82 1000 1000

GEOLOGIC SYMBOLS Qvb BRUSH CREEKFAULT Volcanic rocks of Stevenson Ridge (Miocene–Oligocene)—Interlayered 4 Qs 27 30 tch Qvbtch WW-AKJ736(proj. 985 toft SW) sequence of basaltic andesite to andesite flows, flow breccia, , and clay. Divided G2 OMid WW-270854 (proj. 175 toft SW) WW-ALH542 (proj.1030 ft to SW) 65 OMi into: 88 24 Qs 500 River Wind 500 Qvbtch Qvb Contact—Solid where location accurate; Qs tch Qs 53 46

dashed where inferred; dotted where concealed; 45 Qs Elevation(feet) Andesite and basaltic andesite flows—Dark grayish Elevation(feet) OMvas OMva 69 EOvco 0 s black to dark blackish gray, seriate to porphyritic basalt to basaltic queried where identity or existence questionable Qs 0 EOvco EOvc andesite with minor flow breccia and interlayered pyroclastic rocks. G10 EOvco o Fault, unknown offset—Solid where location accurate; -500 -500 Pyroclastic rocks—Light greenish grey to light green tuff breccia dashed where inferred; dotted where concealed; queried where identity or existence questionable EOvc Qvb 2x vertical exaggeration OMvcs with minor interlayered flow breccia and basaltic andesite to andesite o tch lava flows. Highly altered throughout and weathered to clay in upper OMi portions of layers adjacent to overlying lava flows. Dike—Solid where location accurate; dashed where inferred; dotted where concealed; queried where identity or existence Qs Qs 71 questionable 59 Miocene–Oligocene Intrusive Rocks EOvco EOvc OMid o 74 24 74 Anticline—Solid where location accurate OMvas 72 OMi Dikes (Miocene–Oligocene)—Light to dark gray, aphanitic to fine- 64 OMid 16 grained, locally vesicular, locally porphyritic dikes of variable 36 89 78 OMid A A' Cross section line silica content ranging from to basalt. 16 OMi 26 A A' 25 79 75 NORTHEAST Zone of mineralized or altered rock 87 SOUTHWEST OMid BUCK MOUNTAIN Diorite (Miocene–Oligocene)—Light gray to light brownish 24 OMid 1500 WIND RIVER 1500 OMvc SHIPERDS FAULT ZONE gray, moderately weathered, fine- to medium-grained diorite Shear zone s OMi FAULT ZONE forming large irregular bodies, plugs, and sills throughout the 31 mapped area. 9 65 80 Inferred fault zone Qs 1000 B–B' 1000 Qs EOvco 69 EOvco OMi Qs 72 WW-7025 (proj.645 ft toNW) 81 WW-AGM096 (proj.175 ft toNW) Bedding—Showing strike and dip 16 EOvc Qs OMvas OMidp Diorite porphyry (Miocene–Oligocene)—Highly 25 G11 85 o 500 500 72 EOvc 34 weathered, light grayish tan; porphyritic with large, subhedral o Qvbtch 25 Approximate bedding—Showing strike and dip 79 OMvcs River Wind feldspar laths in a fine-grained matrix of dioritic composition; Qs Elevation(feet) found on top of Big Butte. Elevation(feet) OMid 75 Minor inclined vein—Showing strike and dip G12 0 0 79 EOvc OMvas o EOvc OMvc 85 Minor fault—Showing strike and dip o B s Gabbro (Miocene–Oligocene)—Dark brownish OMigb Minor vertical fault—Showing strike -500 -500 gray, medium- to coarse-grained and locally porphyritic 2x vertical exaggeration gabbro forming plugs on Bunker Hill and the ridge to the 15 16 11 Slip lineation on a fault or shear surface—Showing bearing and plunge north of Trout Creek Hill. Qvbtch 84 Slickensided surface—Showing strike and dip EOvco 62 32 EOvco EOvco Qs Shear—Showing strike and dip –Oligocene Volcanic and Sedimentary Rocks 50 Qs 62 26 EOvco 75 EOvc 75 Joint—Showing strike and dip 74 o 60 65 SS1 BEAR CREEK FAULT 77 45 Qvbtch EOvco Ohanapecosh Formation (Eocene–Oligocene)— Highly Vertical joint—Showing strike 19 79 Qs weathered, locally altered, intercalated volcaniclastic, pyroclastic, Qs 77 24 1 and sedimentary rocks; predominantly tuff and crystal-lithic and 23 Fold hinge of minor anticline—Showing bearing and plunge vitric-lapilli tuff breccia, with lesser pebbly diamictites, fluvial EOvco 44 27 Qs volcaniclastics, thin basalt flows, and minor sandstone; highly 13 Fold hinge of generic minor fold—Showing bearing and plunge Qs 32 86 altered adjacent to intrusive bodies and dikes. EOvco Large cone, vent, , or spatter cone 74 G4 EOvc 69 Geochemical sample locality o 73 Quaternary? to Eocene Tectonic Zones 45 82 Water well OMid OMid 46 Research supported by the U.S. Forest Service, award number AF-046W-P-11-0108 and the U.S. DNR-CRSN 80 11 80 81 A' Department of Energy (DOE), National Geothermal Data System Program (NGDS), under DOE Tectonic zone (Quaternary?–Eocene)—Dark grey to Temperature-gradient well award number DE-EE0002850. The views and conclusions contained in this document are those tz OMi G1 OMid of the authors and should not be interpreted as necessarily representing the official policies, either green, variably clay-and sand-rich fault gouge and fault breccia with 10 EOvc abundant fractures and slickensided surfaces in which geometric Age sample, Potassium-argon (K-Ar) o expressed or implied, of the U.S. Government. relationships between geologic units is highly disrupted and cannot OMvcs Thermal or mineral spring tz 67 be shown accurately at map scale. Unit associated with numerous OMid Buck SHIPERDS FAULT ZONE SS1 77 55 springs and seeps; highly altered. Significant site G13 61 Mountain 10 OMi EOvc o 21 OMvas Disclaimer: This product is provided 'as is' without warranty of any kind, either expressed or 26 EOvc o G14 OMi implied, including, but not limited to, the implied warranties of merchantability and fitness for a 78 particular use. The Washington Department of Natural Resources and the authors of this product will not be liable to the user of this product for any activity involving the product with respect to 88 the following: (a) lost profits, lost savings, or any other consequential damages; (b) fitness of the BRUSH CREEK FAULT OMid 76 OMvas product for a particular purpose; or (c) use of the product or results obtained from use of the product. This product is considered to be exempt from the Geologist Licensing Act [RCW 88 18.220.190 (4)] because it is geological research conducted by or for the State of Washington, Stevenson 11 OMvas 36 Department of Natural Resources, Division of Geology and Earth Resources MOUNT MOUNT Ridge 88 65 15 64 ST. HELENS ADAMS DNR-CRSN 62 65 23 EOvco 77 Qs Qs EOvc 87 OMid 72 OMvcs o 89

503 G15 22 OMva 80 s OMva Qs 14 74 s Trout Lake 24 72 141 88 OMvc Qs 30 s OMvcs EOvc Qs 75 OMvcs o 78 Qs Qvb Wind River tch

Wind River Highway OMva EOvco s Qs OMvas 61

2 G17 Carson Home White Salmon Qs A G16 OMvas B' Stevenson Valley WIND RIVER 14 FAULT ZONE G18 North Columbia River Bonneville OMvas 8 Qs Qs PLqdw SCALE 1:24,000 0 0.3 0.6 1.2 1.8 2.4 3 Wind Mountain Thick zone of highly sheared gouge (unit tz) within the Brush Creek fault—main fault plane traverses photo from upper right to lower left—on steep south-facing slope on MILES north side of Wind River. Viewed to the southwest. Geologist for scale. 0 2,400 4,800 9,600 14,400 19,200 24,000

9 FEET Lambert conformal conic projection North American Datum of 1983 0 0.5 1 2 3 4 5 Base map from scanned and rectified U.S. Geological Survey Qs Stabler, Lookout Mountain, Bare Mountain, and Termination KILOMETERS Point 7.5-minute quadrangles Shaded relief generated from U. S. Geological Survey 10-meter digital elevation model; no vertical exaggeration This geologic map and geothermal assessment were funded by the Digital cartography and GIS by Jessica L. Czajkowski U. S. Forest Service and the U.S. Department of Energy Editing and production by Jaretta M. Roloff and Jessica L. Czajkowski