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Hood River Updates Aging Transmission Main

The City of Hood River transmission main crosses over several creeks along its 14-mile alignment.

The City of Hood River is located approximately 61 miles east of Portland, Oregon, at the confluence of the Hood River with the Columbia River and within view of its namesake, the snowcapped Mount Hood.

Constructed in 1929, the City’s existing 14-inch steel water supply pipeline experienced numerous failures resulting from corrosion and high-operating pressures and exceeded its useful life. The aging structure was evaluated, and construction documents were prepared for the upgrade of the water supply system.

A new 24-inch pipeline will provide more reliable transmission and will allow improved access to the main for the City’s operations staff. The construction was originally planned to occur in five phases, but federal stimulus funding through the U.S. Department of Agriculture Rural Development became available in 2009 that allowed the City to construct the project in two phases. Phase 1 includes 3 miles of new 24-inch transmission main and a new chlorination station using a sodium hypochlorite generation system to replace the City’s gas chlorination system. Structural upgrades, paid for in part by a Federal Emergency Management Act grant, were designed to increase the flood and seismic resistance of the existing steel truss pipe bridge that carries the transmission main across Hood River. Phase 1 was completed in February 2011.

Phase 2 will construct the remaining 12 miles of 24-inch ductile iron transmission main along with appurtenances required to maintain services to approximately 125 current customers in this mostly rural area. Construction of Phase 2 commenced in March 2011 and is expected to be completed by the fall of 2012.

Replacing the existing water transmission line will ensure the continuation of a safe and adequate supply of water to the community.