The City Of Lewiston

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Idaho's Only Seaport
2009 FEMA Drainage Mitigation Project 13th to 16th Streets
The department along with Horrocks Engineers and Riedesel Engineering received two awards at the American Council of Engineering Companies (ACEC) of Idaho 2013 Engineering Excellence Awards.

Awards received were 1st place in Small Projects for the Snake River Avenue/Southway Avenue Roundabout and 1st place in Water and Stormwater for the FEMA Stormwater Drainage Mitigation project in downtown Lewiston.

ACEC Awards


February 2014 - Project Complete.

Update 10/21/13:
Project savings were combined with additional City funds to award a portion of a previously un-awarded Add Alternate as the base project neared completion in 13th and Main Street.  This additional work in Delsol Lane between “G” Street and Idaho Street (as shown below) increases the scope of the Collection contract to include an additional 320 feet of large diameter storm pipe, 2 manholes, and 7 inlets with work scheduled to begin October 21nd after paving the base project is complete. Click image to enlarge.                  

Delsol Lane Alt_Image.jpg

Update 10/17/2013:
The most common question asked recently is, “When will the project be done in Main Street?” The answer is, “Monday.” Paving, scheduled for Monday October 21, marks the end of the Base Project Work. The City and Western Construction would like to thank the businesses in the area and the public at large for working with us through this project. It is always inconvenient to have to do large projects under major roads, but the results will be worth it.

Preparation for paving is currently underway and will be ongoing through the coming weekend. With the new 42 inch storm drain pipe and associated catch basins and manholes, Idaho and “G” Streets, as well as the surrounding areas will be protected from a 50-year storm. This area has experienced persistent flooding and flood damages going back to the 1930’s; often at no more than a 2-5-year storm intensity level. Most recent floods occurred June 26, 2013 and July 20, 2012. 

Update 9/12/13:
On Friday, September 13, 2013, Western Construction will be paving DelSol Ln. from Main St. to “G” St.  then move paving operations to Lincoln St. from “G” St. to “F” St.

On Monday, September 16, 2013, paving will continue with Jefferson St. from Main St. to “F” St. then moving to “F” St. from Jefferson St. to Lincoln St. 
Detour routes around the work area will be signed.  

Update 8/23/2013:
On Monday, 8/26/2013, work will continue on Main Street and the east bound lane will be closed from 13th St to Lincoln St (2 blocks) with a detour signed around the area.  This detour is expected to last about a week.

Update 8/22/2013:
In preparation for Hot August Nights, the area of Main Street impacted by the project has been cleaned up with an asphalt patch and other work zones are being cleaned. Approximately 50% of the new storm drain pipe in the Collection portion of the project has been installed. This includes Delsol Lane, G Street, Lincoln Street, F Street, and Jefferson Street.

On Monday, August 26, Western Construction will resume work in Main Street in front of the Eagles and work their way west on Main Street to the 13th Street intersection. From there, work will be along 13th Street heading south until reaching the intersection with Idaho Street where the project’s scope of work will be complete.

Some construction photos (hover mouse over photo for description):

Backfilling Pipe in Delsol

Manhole Section and Lid

Sawcutting at Lincoln and F Sts

Update 7/23/2013:
Beginning 9:00 am morning of Wednesday, July 24, 2013, Western Construction will be working in G Street at the intersection with Delsol Lane.  The public can expect closure of G Street at the intersection.   Detour routes around the work area will be signed and temporary access preserved for local business.  This project is a continuation of the FEMA funded Stormwater Drainage Mitigation project. This work includes installation of new 42 inch storm drain pipe and associated catch basins and manholes.
Update 7/11/2013:
Stormwater collection line installation has started this week!  Western Construction & Excavation is mobilized and materials are arriving. The first work zone is Delsol Lane between Main Street and G Street.  Access to the businesses will be open throughout the project.

The first Progress meeting for Collections will be 10 am Thursday July 18 at the Lewiston Community Center, the public is welcome to attend.

Pipe delivered for Collection.JPG

Update 7/9/2013:
Work starts tomorrow!  Beginning the morning of Wednesday, July 10, 2013, Western Construction will be working in Delsol Lane adjacent to the intersection with Main Street.  The public can expect closure of Delsol Lane at the Main Street intersection while Main Street will remain open in both lanes.   Detour routes around the work area will be signed and temporary access preserved for local business.  This work includes installation of new 42 inch storm drain pipe and associated structures.   

Update 6/11/13:
Project awarded to Western Construction in the amount of $722,179 at the June 10, 2013 City Council meeting.  Funding for this project comes from the Federal Emergency Management Administration (FEMA) at 75% and the remaining 25% from property tax and staff inkind services.  This project will install a network of storm drainage pipes, inlets, and related structures to outfall pipes constructed under a separate project and contract.

General Description

The City was awarded a Federal Emergency Management Agency (FEMA) Pre-Disaster Mitigation grant in the amount of $2,124,944 to upsize and reconstruct the stormwater drainage system downtown from 13th Street to 17th Street (see Map of Project Area on right), significantly reducing flooding to approximately 90 structures and maintaining access to critical facilities including Police, Fire, City Hall, and Nez Perce County offices.

The downtown area is a low-lying area near the confluence of the Snake and Clearwater Rivers.  Prior to the construction of the levees in 1972, separating the city from the Lower Granite Reservoir, the project area was considered part of the flood plain of the Clearwater River.  Stormwater, collected from the downtown areas and areas of higher elevations, drains from the city stormdrain system into the US Army Corps of Engineers (USACOE) stormwater drainage system.  From the existing ponds, it is then pumped up into the Lower Granite Reservoir. The infrastructure currently in place to provide stormwater drainage and conveyance of the stormwater to the existing levee ponds has proven over time to be inadequate.  The network of inlets, catch basins and pipes collecting and conveying stormwater from the catchment area to the USACOE ponds is inadequate. The U.S. Highway 12 Bypass and the BNSF Railroad are located between the urban area and the levee ponds.  The pipes conveying stormwater under the highway and railroad are also inadequate for high intensity rain events.  Upsizing and improving these pipes are included in this project.  Construction of these pipes may include jacking and boring or other trenchless construction methods.

Public involvement and participation is an important component of this project and are listed below.  Your comments and concerns are important!  Please feel free to contact us with any questions, concerns or comments.  You can call, email, or stop by.  We want to hear what you have to say!

Project Timeframe

  • Corps of Engineers Approval April 2012
  • Bids Open May 30, 2012
  • Bid Rejection by City Council 6/25/2012
  • Rebid March 2013
  • Prebid April 3
  • Bid Opening April 16, 2013
  • Council Award June 10, 2013 
  • Construction - 2013

Public Involvement
Design Stage Activities

Construction Stage Activities
  • Individual Property Owner Meetings as needed
  • 4 Community Meetings are planned - TBD
  • Press Releases
  • Open Weekly Construction Progress Meetings


Project Manager
Joe Kaufman, PE
Stormwater Program Coordinator

215 D Street
P O Box 617
Lewiston, ID  83501
Public Works Department

Map of Project Area

Stormwater Master Plan
Drainage Basin 13

Bid Documents

Project Plans - For Reference Only

Geotechnical Report

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