Reconnaissance study of sediment transport by selected streams in the Yakima Indian Reservation, Washington, 1974 water year

Boucher, P.R.

doi:10.3133/ofr7567

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2015

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“…The selective (non-clearcut) logging practiced on most Yakama lands seldom affects the streams. Suspended-sediment transport is relatively low (Boucher, 1975) and typically attributable to landslides, downslope soil creep, sloughing of road embankments, and streambank erosionespecially during uncommon downpour-induced floodflows.…”

Section: Da Iry Ckmentioning

confidence: 99%

Geologic map of the Simcoe Mountains Volcanic Field, main central segment, Yakama Nation, Washington

Hildreth¹,

Fierstein²

2015

Scientific Investigations Map

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Scientific Investigations Map 3315Photograph showing Mount Adams andesitic stratovolcano and Signal Peak mafic shield volcano viewed westward from near Mill Creek Guard Station. Low-relief rocky meadows and modest forested ridges marked by scattered cinder cones and shields are common landforms in Simcoe Mountains volcanic field. Mount Adams (elevation: 12,276 ft; 3,742 m) is centered 50 km west and 2.8 km higher than foreground meadow (elevation: 2,950 ft.; 900 m); its eruptions began ~520 ka, its upper cone was built in late Pleistocene, and several eruptions have taken place in the Holocene. Signal Peak (elevation: 5,100 ft; 1,555 m), 20 km west of camera, is one of largest and highest eruptive centers in Simcoe Mountains volcanic field; short-lived shield, built around 3.7 Ma, is seven times older than Mount Adams.

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Section: Da Iry Ckmentioning

confidence: 99%