Projects - Bridges

 

Middle Fork Payette River Bridge Replacement

Crouch, Idaho

This project requires replacing an existing 14-foot wide, single-lane bridge, with a new two-lane bridge with approaches.  The existing bridge is a narrow two-lane structure with four spans.  Three spans have timber stringers and one has steel beams.  The bridge, supported on piles, has concrete abutments and center pier, but the intermediate bents consist of timber piles with no concrete pier.  The Bridge Field Inspection Report and the Structure Inventory and Appraisal developed by the Idaho Transportation Department indicate a sufficiency rating of 23.7.  The proposed new 2-lane bridge, designed to current standards, will considerably improve reliability of the river crossing and enhance the safety of commerce into the city.  The bridge location might also be adjusted upstream to address traffic access concerns, due to a sharp “S-curve” in the approach to the structure from the city of Crouch.  The existing road will be re-aligned to improve safety.

Services Provided by HECO Engineers:

  • Survey
  • Civil Engineering
  • Public Relations
  • Project Management
  • Preliminary Engineering
  • Construction Documents
     


Substation Road Bridge

Emmett, Idaho

This project included design of reinforced concrete stiff leg culvert to replace the existing cast in place concrete slab bridge.  The bridge is on a 30 degree skew with the center line of road.  The new stiff leg culvert is 186 feet long and spans a canal opening of 15 feet.  This project is funded through FHWA and HEC managed the design process.  Project design process included concept design, preliminary design, public involvement, environmental approvals, and final design.



Services Provided by HECO Engineers:

  • Survey
  • Civil Engineering
  • Public Relations
  • Project Management
  • Preliminary Engineering
  • Construction Documents
     

 

Superior Street / Mill Road

Cambridge, Idaho

This is a FHWA funded project that reconstructs 0.25 mile of Superior Street to establish proper storm water runoff, realignment and widening of the roadway from Rush Creek to the three-way intersection to improve safety, and widening of pavement, replacement and extension of existing sidewalks, construction of a buffer zone along the new sidewalk, construction of vertical curbs, construction of valley gutter, replacement of storm sewer system on the east and west sides of the roadway, replacement of culverts at Rush Creek with a new 50-foot span bridge.  The stream channel was restored to a natural state and the banks were armored with riprap. Environmental documents were prepared for a Categorical Exclusion determination.

Services Provided by HECO Engineers:

  • Survey
  • Civil Engineering
  • Public Relations
  • Project Management
  • Preliminary Engineering
  • Construction Documents

     


Gulch Road Bridge

Payette County, Idaho

This project included the design of a 50-foot steel girder bridge with corrugated galvanized steel deck and asphalt wearing surface.  The design consisted of evaluation of the existing concrete abutments, repair, and modifications of the existing abutments and wing walls.  Design of the superstructure to meet AASHTO LRFD Bridge.  HEC provided cost estimates, preliminary design, and final design of the steel girders and corrugated steel deck.  This project was funded through LHTAC Emergency Funds to replace the existing structure that collapsed during the 2011 spring runoff.



Services Provided by HECO Engineers:

  • Survey
  • Civil Engineering
  • Public Relations
  • Project Management
  • Preliminary Engineering
  • Construction Documents
     

 

Ward Road and Cow Creek Road Bridges over Rush Creek

Washington County, Idaho

This project included the design of reinforced concrete  abutments and wingwalls for the existing steel girder bridges.  The project is funded by FEMA to replace soured abutments.  The design included calculations and drawings for the concrete abutments and wingwalls. 

HEC provided cost estimates, preliminary and final design, permitting, contract documents, and construction administration for these two bridge projects.  Abutments and wingwalls were designed per AASHTO LRFD.  Plans were reviewed and approved by FEMA.

Services Provided by HECO Engineers:

  • Survey
  • Civil Engineering
  • Public Relations
  • Project Management
  • Preliminary Engineering
  • Construction Documents