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Powers to Agness Hwy (SR 242) Stabilization and Realignment

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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