Surface Water Management

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Project Description

Lorenzan Creek is a salmon bearing stream that flows under Skagit County's road shop, 0.8 miles upstream of its confluence with the Skagit River in Concrete, WA. The creek flows under the shop in an 18” concrete culvert that is 360 feet long. The condition of the culvert may not be sufficient to convey high flows, which can potentially exacerbate flooding in the town of Concrete. Pollution is also a concern because stormwater drainage from about a square mile of paved surfaces discharges directly to the creek through multiple storm drains. Additionally, this culvert is too small to allow adequate fish passage, per a WDFW assessment completed on May 29, 2018 (WDFW Site ID:GR18).

This project is being led by Skagit County. Four alternatives will be examined and ranked for cost, water quality benefit, feasibility, stakeholder support, and other metrics determined by the stakeholders. A preferred alternative will be selected and designed. That design will then be used to request funding to complete the project, and eventually for construction.

Project Goals

The overall goals for this project include:

• Reduce potential for pollutants to enter Lorenzan Creek via stormwater runoff
• Improve stormwater system to make maintenance achievable
• Restore fish passage in Lorenzan Creek
• Reduce upstream flooding

Phase 1 work involves analyzing the existing stormwater facility and providing recommendations to improve water quality by reducing the frequency and potential of pollutants entering the stream.

RECORDING: Lorenzan Creek Community Meeting (March 15, 2023)

Updates & Monthly Communications

2024

• October - November
• August - September
• July
• 2023 - May

2023

• April - January
• March: Alternatives Analysis and Design | Workshop Presentation
• Workshop #2 Summary | Notes | Invitation

2022

• VIDEO: Presentation to the Board of outy Commissioners: October 18, 2022
• VIDEO: Presentation to the Board of outy Commissioners: March 1, 2022
• January - February
• January - May

2021

• May
• June - July
• August - September
• October
• November
• December
  
  

Project Partners and Stakeholders

Stakeholders and key partners in and near the project area will be involved throughout the project duration. The project will explicitly involve stakeholders and partners at key points during the decision-making process, including (but not limited to):

• Alternative development and selection
• Formation of the alternative selection criteria/decision matrix
• Selection of a preferred alternative

Project Partners:

• Skagit County Public Works
• Washington State Department of Ecology (Ecology)
• Puget Sound Energy (PSE)
• Project Design Team:
• Skagit River System Cooperative (SRSC)
• Upper Skagit Indian Tribe
• Washington Department of Fish and Wildlife (WDFW)

Stakeholders:

• Town of Concrete
• Washington State Department of Transportation (WSDOT)
• United States Army Corps of Engineers (USACE)
• United States Fish and Wildlife Service (USFWS)
• National Oceanic and Atmospheric Administration (NOAA)
• Skagit Watershed Council
• Skagit Fisheries Enhancement Group (SFEG)

Project Funding Sources

• Washington Department of Ecology (ECY)
• Puget Sound Energy (PSE)
• Skagit County

FAQ's

• February 7, 2022

Documents

• Stormwater Facility Background and Inspection Report (9/20/24)
• Existing Conditions Report

Workshop #2: March 15, 2022

• Presentation

Workshop #1: January 26th, 2022 | Agenda Packet | Meeting Notes

• Evaluation Criteria
• Design Alternatives
• Hydraulic Analysis
• Alternatives Analysis Final Report [55MB]

Contacts

Skagit County:

Emily Derenne - Project Manager, Restoration Ecologist: 360-416-1449 emilyjd@co.skagit.wa.us

Jason Quigley - Project Manager, Stormwater Coordinator: 360-416-1463 jasonq@co.skagit.wa.us

Herrera:

Colleen Mitchell - Project Lead, Associate Engineer: 360-684-1741 cmitchell@herrerainc.com