STATE HIGHWAY 74 / OKLAHOMA DEPARTMENT OF TRANSPORTATION

Triad is designing improvements for eight miles of State Highway 74 (Oklahoma City’s Portland Ave.) to eliminate flooding, improve safety and increase the roadway’s capacity as it is linked with Interstate 35 via the progressing east-west Covell Corridor. The existing two-lane is SH 74 rated critically inadequate for present and future traffic volumes and includes two bridges rated among the most dangerous in the state.

SH 74 will be renovated into a four and five lane corridor from Oklahoma City’s Memorial Road at Lake Hefner Parkway, north to the Logan County Line. The roadway will include signalized intersections, 2 mainline bridges and a Deer Creek overflow bridge. Triad completed extensive hydraulic, FEMA, CLOMR Stormwater Flood studies to determine flood plain easements with complex analysis necessary north of Covell at Deer Creek due to increasing flood plain elevation.

The first SH 74 Corridor section to be completed replaced the Bloody Rush Creek Bridge, with an adjacent five-lane roadway widening to five lanes and signalized intersection near the Logan County - Oklahoma County line. Currently under construction is a new five-lane facility from NW 234th (Sorghum Mill) to NW 206th (Covell), replacing the two-lane Deer Creek and overflow bridges with five lane structures. Progressing concurrently, from the east are the first and second sections of the Covell Corridor, also designed by Triad.

Triad has completed preliminary plans for the acquisition of SH 74 Right of Way from Memorial Road to Covell Road including the realignment of a controlled access facility from Memorial Road north to NW 164th Street, with frontage roads and Texas Turnarounds at the proposed NW 150th Street interchange

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