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Powers to Agness Hwy (SR 242) Stabilization and Realignment

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Powers to Agness Hwy (SR 242) Stabilization and Realignment
Coos County, Oregon

GRI investigated seven roadway slope failures and two major roadway re-alignments along the Coquille River. The work entailed extensive geologic mapping; drilling and sampling of 31 borings and 18 test pits in soil and rock; extensive direct shear and residual strength testing in our laboratory; installation of slope inclinometer casings, vibrating-wire piezometers, and data loggers in each boring; monitoring of the instrumentation for 8 months; and development of alternatives for repairing the roadway failures and constructing the re-alignment sections. The re-alignment will include two bridges up to 420 ft long supported on large-diameter drilled shafts and piles.

Key Staff

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