Transportation Engineering

Extending Stormwater Infrastructure to Laurie Ave.

The project will install a new 12-inch diameter stormwater main on 436 feet of Laurie Avenue south of Courtney Ave and 6 catch basins to reduce the frequency of flooding. Additionally, 300 feet of stormwater main on Courtney Avenue west of Laurie Avenue will be replaced with 12-inch diameter stormwater pipe. 

Why

The new stormwater main and catch basins are expected to reduce flooding and convey a 10-year storm event.

Schedule

• Design: June 2023 to April 2024
• Construction: Sept. 2024 to June 2025

Traffic impact

Expect delays on Laurie Ave and Courtney Ave during construction.

Current activities

Surveying and design services. 

Funding

• Project estimate $800,000.
• Funding is from county road funds.

Ensuring all traffic can cross the bridge without weight restrictions.

The Abernethy Creek (Holly Lane) Bridge crosses Abernethy Creek in the Oregon City area. The bridge has weight restrictions for traffic due to deficiencies in the concrete deck, floor beam cracks, and weakness of the gusset plates and will be replaced to current design standards. 

Why

To carry travelers without load restrictions for all traffic including emergency response and commercial truck traffic.

Schedule

• Design: Winter 2025 to Spring 2027
• Right of way: Winter 2026 to Spring 2027
• Construction: Spring 2027 to Winter 2028

Traffic impact

Expect delays or closures during construction.

Current activities

Waiting for funding agreement to initiate bid proposal for engineering design. 

Funding

• Project estimate $1.4 million
• Funding is provided from the county road funds

Convert the intersection to a roundabout, widen the travel lanes to 12 feet, and add bike lanes.

We will also replace the culvert at Boeckman Creek under the intersection with a fish passable culvert, and add stormwater facilities to treat water runoff.

Clackamas County will partner with Washington County, Clean Water Services and the City of Wilsonville since the intersection spans multiple jurisdictions.

Why

To reduce congestion and improve safety for all travelers, and provide safe passage for fish and other wildlife though waterways.

Schedule

• Project planning and design: October 2024 – Dec 2026
• Right of Way Acquisition Efforts: Fall 2025 – Spring 2027
  All right of way acquisitions are conducted as required by state and federal law. Read right of way brochure: English | Spanish.
• Construction: Spring 2027 – Winter 2028/2029

Current activities

• Engineering design
• Attend the Feb. 11 open house to learn more and get your questions answered from 5:30-7:30 p.m. at Wilsonville City Hall. 

Traffic impact

• Road closures are anticipated for a portion of this project. When construction work can safely occur with traffic, one lane will be closed at a time.  

Funding

• Project estimate $14 million
• Funding is provided from Community Road Fund and Transportation System Development Charges, City of Wilsonville funds, and Washington County funds

Other resources

• Presentation to Stafford Hamlet [video], Nov. 12