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Witch Hazel Village South Concept Plan
…on River Road in Washington County, Oregon. DOWL’s team prepared the preliminary master plan, led early discussions with key agency and departmental staff, completed the infrastructure studies, and developed the…
I-5: Willamette River Bridges (Whilamut Passage)
…an emergency detour bridge that would carry busy Interstate 5 (I-5) traffic while the team designed and constructed a permanent replacement. Getting there was a complex task. For starters, the…
Peter Courtney Minto Island Bridge
…for final design, DOWL developed an iconic 305-foot-long inclined arch cable-stayed bridge, along with 6,000 feet of trail. The completed project provides Salem commuters with a car-free connection into downtown…
Sunrise Expressway
Commercial and residential traffic on the busy eastside industrial part of the Portland metro area, to and from I-205, led to congestion, limited business access, and cramped multimodal options. DOWL…
Chambers Covered Bridge
…tilt further to the side, causing concern that the bridge could completely fail. The City declared an emergency to dismantle it in early spring rather than waiting for summer. Due…
Williams Northwest Pipeline Bridge Inspections
…for use during inspection and maintenance. Our inspections of Williams Northwest Pipeline Bridge infrastructure included the Flaming Gorge bridge, as well as Green River and Kemmerer compressor stations in southwest…
Meadow Creek Fish Passage
…for Coho, chinook, and sockeye salmon. DOWL provided the full suite of design and support services, including a geotechnical investigation, topographic survey, and geomorphic analysis. DOWL completed a cost-benefit analysis…
Warm Springs Creek Emergency Bridge Replacement
During severe flooding, significant erosion occurred behind the bridge wingwalls resulting in the road closure of Highway 191. Highway 191 is an important transportation corridor serving the rural communities of…
Blacktail Deer Creek Floodplain Study
DOWL has completed the hydraulic modeling and mapping for a new enhanced level (with floodway) floodplain study for an 11-mile reach of Blacktail Deer Creek in Beaverhead County. This flood…
Bighorn Canal
…during irrigation season. DOWL designed several reconstruction projects, including the replacement of two flumes with eight-foot and nine-foot-diameter inverted siphons as well as a new wasteway structure. DOWL also completed…