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The 1980 Polallie Creek debris flow and subsequent dam-break flood, East Fork Hood River basin, Oregon

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The 1980 Polallie Creek debris flow and subsequent dam-break flood, East Fork Hood River basin, Oregon; 1984; OFR; 84-578; Gallino, Gary L.; Pierson, Thomas C.

Summary

At approximately 9 p.m. on December 25, 1980, intense rainfall and extremely wet antecedent conditions combined to trigger a landslide of approximately 5,000 cubic yards at the head of Polallie Creek Canyon on the northeast flank of Mount Hood. The landslide was transformed rapidly into a debris flow, which surged down the channel at velocities between about 40 and 50 ft/s, eroding and incorporating large volumes of channel fill and uprooted vegetation. When it reached the debris fan at the confluence with the East Fork Hood River, the debris flow deposited approximately 100,000 cubic yards of saturated, poorly sorted debris to a maximum thickness of 35 ft, forming a 750-ft-long temporary dam across the channel. Within approximately [...]

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Type Scheme Key
local-index unknown ofr84578
local-pk unknown 8956
series unknown Open-File Report

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journalOpen-File Report
edition-
languageENGLISH
citationTypeReport

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