OKLAHOMA DEPARTMENT OF TRANSPORTATION

Triad designed improvements for eight miles of State Highway 74 to improve public safety, control flooding, and increase the roadway's capacity as it is linked with Interstate 35 via Edmond's east-west Covell Corridor. From Memorial Road at Lake Hefner Parkway, north to the Logan County Line, the existing two-lane highway is being reconstructed into a four and five lane corridor in four project segments. The new roadway includes signalized intersections and the replacement of two mainline bridges and one overflow structure. All three span bridges had previously been rated among the most dangerous in the state.

The first completed project, from one-half mile south of the Logan County/Oklahoma County line, to one-half mile north of the Logan County line, replaced the Bloody Rush Creek Bridge with a five-lane structure and widened the adjacent roadway with left turn lanes and shoulders.

For the next segment, from NW 234th Street (Sorghum Mill) to NW 206th Street (Covell) Triad completed extensive Hydraulic and Stormwater Flood Studies to determine flood plain easements. A FEMA CLOMR was required and, north of Covell at Deer Creek, complex analysis was necessary due to increasing flood plain elevation. The new five-lane facility with signalized intersections opened in 2009 with traffic maintained on the old highway throughout construction. Three undivided five-lane structures replaced the two-lane Deer Creek, Deer Creek Overflow, and Unnamed Creek Bridges.

The next project scheduled for construction is from south of NW 150th Street north to NW 164th Street and includes rebuilding SH 74 to a four-lane divided freeway, constructing an interchange at NW 150th Street, and constructing one-way frontage roads.

The final project scheduled for construction is from NW 164th Street to north of Covell Road and includes rebuilding SH 74 to a four-lane divided highway with signalized intersections every mile.

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