H&H provided hydrologic analysis, scour assessment and structural bridge design services for the replacement of the Phoenix Road Bridge, which is located near the Prettyboy Reservoir in Baltimore, Maryland.

In support of the Phoenix Road bridge replacement, H&H performed hydrologic and hydraulic analysis of Big Gunpowder Falls. The project is unique in that it is located along a river between two significant dams.

The analysis required hydrologic modeling of over 80 square miles of drainage basin and flood routing through several miles of river channel and reservoirs. HEC-HMS was utilized to model hydrologic conditions and perform dam modeling at the analysis point, then HEC-RAS was used to model riverine conditions at the bridge crossing. A hydraulic report was submitted.

Additional scope of work included foundation design, substructure design, and scour assessment utilizing FHWA’s HEC-18, HEC-20, and HEC-23 methodology.

The existing bridge’s five-span deck truss structure will be replaced with a new two-lane multi-span steel girder bridge.