Marine Construction

Bonneville Lock & Dam Washington Shore Ladder Entrance Modifications

The Bonneville Lock and Dam is located approximately 145 river miles from the mouth of the Columbia River between Oregon and Washington. An existing fish ladder has provided Chinook and Coho salmon a means around the hydro facility at the dam to their spawning areas upstream. Lamprey, an eel-like fish with no fins, have not … Continue reading Bonneville Lock & Dam Washington Shore Ladder Entrance Modifications

South Waterfront Greenway – Central District Improvements

This 100-foot wide regional park extends along the riverbank and near-shore area of the Willamette River for a little over a mile between the Marquam Bridge and an existing trail at John’s Landing. This project also is one of the first in the region to attempt large-scale restoration of a blighted riverbank into functioning habitat … Continue reading South Waterfront Greenway – Central District Improvements

Bonneville Bradford Island Branch B Fish Ladder Repair

This emergency project for the historic Bonneville Branch B Fish Ladder on Bradford Island at the Bonneville Dam on the Columbia River was necessary to repair a scoured fish ladder structure and replace the failed riprap revetment. This work involved a very strict in-water work window to complete the fish ladder and allow the US … Continue reading Bonneville Bradford Island Branch B Fish Ladder Repair

Lake Oswego Interceptor Sewer – Lake Down Contract

The Lake Down Contract involved the installation of over 7,300 feet of previously fused large-diameter high density polyethylene pipe at grade tolerances of 0.02 inches to connect the buoyant interceptor to the existing sewer system. Pile supports and caps and pipe cradles were welded to steel piles to support the new pipeline and a cathodic … Continue reading Lake Oswego Interceptor Sewer – Lake Down Contract

75MGD Transmission Conduits – Geren Island Phase 1

In the late 1990’s the city of Salem experienced flooding and resulting water shortages that made the improvements to the existing water system a priority. This project was part of the Mutual Agreement and Order (MAO) between the City of Salem and the Oregon Department of Environmental Quality (DEQ) designed to add 75 million gallons … Continue reading 75MGD Transmission Conduits – Geren Island Phase 1