PROJECT: Water Resources

SH16, US-20/26 to SH-44

Ada County, Idaho


Parametrix on behalf of Connecting Idaho Partners and Idaho Transportation Department

Construction Value:



This project extended SH-16 in a new two-mile alignment from SH-44 (State Street) across the Boise River to connect to US-20/26 (Chinden Boulevard).

Services included:

  • Floodplain and floodway analysis
  • River surveying
  • Assessment of bridge effects 
  • Development of mitigation to demonstrate “no-rise”

T-O assisted with floodplain permitting and associated agencies including the Federal Emergency Management Agency (FEMA), Ada County, the City of Star, the Federal Highway Administration (FHWA), and the Corps of Engineers. T-O Engineers completed this significant hydraulics and related survey work on time and under budget.