Project Area:

The Project Area is outlined in red on the map below. Click on the image to view the map at full size in a new window.

Click to Download Project Area Map

Project Schedule:

The project is intended to be completed over a 50 week period. Work began in January 2020 and is expected to be completed by 12/30/2021. The following deliverables are scheduled:

The anticipated schedule is shown below:


Draft / First


Final / Second

Public Meeting

 Selected Plan

Baseline Hydrology Report


4/24/2020 5/15/2020



Alternatives Analysis


7/31/2020 4/22/2021 March 2021 April 2021

Conceptual Design

6/17/2021 7/8/2021 12/30/2021



Major Issues:

  • Identify the flood hazards within the watershed.

Project Goals:

  • Identify localized, non-regulatory flooding,

  • Identify how drainage improvements completed since the 1980 Major Basinwide Planning have impacted drainage patterns,

  • Determine if the existing infrastructure has capacity for the 100-year event,

  • Program capital improvements to reduce non-regulatory flood hazards - detention and conveyance, and

  • Identify water quality improvement opportunities.

Project Approach:

  • Evaluate flood history in the watershed

  • Define design hydrology

  • Define current non-regulatory flood hazards

  • Identify flow capacity limitations

  • Complete an alternatives analysis of potential improvements

  • Identify water quality opportunities

  • Integrate useable open space, trails, landscape improvements, natural areas, and water quality into stormwater management

  • Estimate the cost of infrastructure needs

  • Include public input regarding capital improvements in the watershed

  • Develop a Conceptual Plan for the Selected Plan improvements

Key Previous Studies:

  • Basinwide Drainageway Planning City of Lafayette and Surrounding Boulder County Colorado Phase A: Development of Alternatives, Camp Dresser & McKee Inc., March 1980.

  • Major Basinwide Planning City of Lafayette / Boulder County Phase B Development of Preliminary Plan, Camp Dresser & McKee Inc., December 1980.

  • Lafayette-Louisville Boundary Outfall Systems Plan Conceptual Design Report, McLaughlin Water Engineers Ltd., May 2011.

  • Town of Erie Outfall Systems Plan (West of Coal Creek), RESPEC Consulting & Services, January 2014.

  • Coal Creek and Rock Creek Major Drainageway Plan, RESPEC Consulting & Services, October 2014.

  • Flood Hazard Area Delineation Coal Creek and Rock Creek, RESPEC Consulting & Services, November 2014.