Arthur R. Bowman Dam Safety of Dams Modifications Environmental Assessment

The Bureau of Reclamation has issued a Finding of No Significant Impact and Final Environmental Assessment for Safety of Dams Modifications at Arthur R. Bowman Dam located on the Crooked River about 20 miles southeast of Prineville, Oregon.

This FONSI and Final EA outline Reclamation’s analysis to correct safety deficiencies which show a potential threat of dam failure exists should the structure be overtopped during a major flood event.

The Final EA documents Reclamation’s compliance with the National Environmental Policy Act (NEPA) and addresses two alternatives: Alternative A – No Action; and Alternative B – the Proposed Action calling for the construction of a concrete parapet wall.

The concrete parapet wall would be 1-foot thick and 6-feet-high and located on the upstream side of the dam crest. It would provide about 30,000 acre-feet of additional emergency storage and reduce the potential risk of loss of life. The emergency storage would not be available for added project benefits.

The Draft EA was made available in November 2009, with copies sent to governmental agencies, elected officials, Native American Tribes, irrigation districts, and the interested public. Comments received on the Draft EA are addressed in the FONSI and Final EA.

03/2010 Addendum PDF 993 kb
02/2010 Arthur R. Bowman Dam Safety of Dams Modifications Final EA and FONSI PDF 4 mb


Candace McKinley
(509) 573-8020

Bureau of Reclamation
Columbia-Cascades Area Office
1917 Marsh Road
Yakima WA 98901-2058

Last Updated: 4/19/23