We are designing the Basalt Creek Parkway Extension between Grahams Ferry and Boones Ferry roads.
Both 124th Avenue/Basalt Creek Parkway opened in 2017, linking Tualatin-Sherwood and Grahams Ferry roads. That was the first piece of a planned interconnected transportation network to support future development in the 850-acre Basalt Creek Planning Area. Planning for this area is a cooperative effort among the cities of Tualatin and Wilsonville and Washington County.
Both the Basalt Creek Parkway and the Basalt Creek Parkway Extension are key elements of the Basalt Creek Transportation Refinement Plan.
The Basalt Creek Parkway Extension will have two lanes in each direction with multiuse (bicycle and pedestrian) paths and streetlights on both sides. A bridge will span Tapman Creek and adjacent wetlands. A new traffic signal will be installed where Basalt Creek Parkway connects with Boones Ferry Road. The street increases transportation system capacity to meet freight and commuter needs.
Background
The Basalt Creek area currently lacks connected transportation facilities needed to support economic and urban-level development. The cities of Tualatin and Wilsonville and Washington County approved projects to be constructed over time. These include the extension of 124th Avenue and Basalt Creek Parkway to connect Tualatin-Sherwood and Boones Ferry roads.
The Basalt Creek Parkway Extension is an important piece of the interconnected transportation network needed to serve over 1,700 acres designated for industrial development in the cities of Tualatin, Wilsonville and Sherwood. The area is expected to create up to 14,000 jobs. The cities and county continue working together to implement the plans for this significant employment area.
Design start: Winter 2020
Design finish (expected): Dependent on funding
Construction: Dependent on funding
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Update
12/19/2025: We continue to look for funding opportunities.
Funding
Cost Estimate: $8.7 million (design); $66 million (to complete)
Funding sources (design only):
- Major Streets Transportation Improvement Program (MSTIP)
- MSTIP Opportunity Fund
- Transportation Development Tax (TDT)
- Road Fund Capital
Newsletters
Reports
Biological Resources Report Summary
No plant or animal species protected under the Endangered Species Act were found in the project area. In-water work will be restricted to July 15 - October 30 to limit impacts to fish. We are required to mitigate any impacts to wetlands and waters. We will replace trees and shrubs removed during construction with at least as many plants of native species. We will add about 3 acres of native seeds next to the roadway.
The project area has many invasive species. We have been advised to clean plant material from equipment and limit the amount of land disturbed to reduce the spread. About four acres of treatment for weed control is expected.
Full biological resources report
Endangered Species Act Determination of No Effect
No state or federally listed endangered species or critical habitats were found in the area of potential impact for the Basalt Creek Parkway Extension project.
Determination of No Effect memo
Noise Report Summary
This report looks at the noise impacts expected from the road extension. We use this to determine if it is feasible and reasonable to build sound walls. We use Oregon Department of Transportation guidelines. A reasonable cost per property owner is less than $25,000.
On the north side of the proposed road sound walls would cost about $267,000 per property owner. On the south side of the road it would cost $114,000 per property owner. The cost of sound walls is too high to be reasonable. Sound walls are not recommended on this project.
Full noise report
Wetland Delineation Report
The Department of State Lands is reviewing the wetlands delineation report for the Basalt Creek Parkway Extension project.
Wetland delineation report
Prior events and comment opportunities
Open House: Feb. 25-March 13, 2022
Update: February 2021
Update: October 2020
Open House: Oct. 23, 2019
Open house: June 11, 2019
Basalt Creek Transportation Refinement Plan Alternatives
- Transportation Refinement Plan (beginning on page 318)
City concept plans
Questions and answers
- What is the project’s National Environmental Policy Act (NEPA) classification of the Basalt Creek Parkway Extension?
The three levels of environmental review for FHWA are categorical exclusion, environmental assessment, and environmental impact statement. The initial recommendation for this project is a “categorical exclusion.” More information can be found on the Federal Highway Administration website and in Oregon Department of Transportation NEPA Manual.
- How did the Basalt Creek Parkway Extension Project get a categorical exclusion classification?
The classification was recommended by the Oregon Department of Transportation (ODOT) and tentatively confirmed by the Federal Highway Administration (FHWA). ODOT environmental resource specialists reviewed the environmental scope of the project and conducted a site visit with the County. During the site visit, the ODOT environmental resource specialists met with several property owners along the canyon and were able to access the canyon. FHWA requested a preliminary historic analysis and noise report, which were conducted and submitted. The initial recommendation was a categorical exclusion.
- Does categorical exclusion mean the Basalt Creek Parkway Extension Project may avoid environmental review and permitting?
No. The project is conducting the necessary environmental studies in accordance with local, state and federal requirements.
- Could the NEPA classification of a project change?
Yes. All environmental reports will be submitted to FHWA, who will review the project and its impacts. FHWA may conclude additional analysis is needed and upgrade the classification to an Environmental Assessment (EA).
- What reports does NEPA require to be submitted?
Reports to be submitted include:
- Noise analysis
- Biological resource report
- Threatened and endangered species study
- Wetland delineation report
- Wetland functional assessment report
- Archaeological and historic resources reports
- Hazardous Materials Corridor Assessment
- Stormwater report, and
- Joint permit application to the U.S. Army Corps of Engineers and the Oregon Department of State Lands.
Please note, the Basalt Creek Parkway Extension Project is also producing technical reports such as a hydraulics report and a geotechnical report.
- Are the Basalt Creek Parkway Extension Project reports available to the public?
Final reports will be uploaded to the project website in accordance with ORS 135.230 to 135.290.
- Are there challenges with the road grade for the Basalt Creek Parway Extension Project?
No. The project will have a grade of 4%, which is less that the County’s 10% maximum and less than ODOT’s 6% maximum.
- Will noise be mitigated for the Basalt Creek Parkway Extension?
The noise analysis assessed noise impacts during the peak commute hours. Using ODOT noise abatement criteria which is based on FHWA criteria, building sound walls along the road would have a limited benefit are not cost-effective, therefore are not recommended.
- How will the wildlife in the canyon be impacted by the Basalt Creek Parkway Extension Project?
Temporary impacts to the canyon are expected during bridge construction. Impacted areas will be rehabilitated.
The work site will be left in a secure manner daily to ensure safety of people and animals. It is important to note, the wildlife in the canyon are species familiar with the built environment of humans and tend to avoid areas when people or machinery are present.
The preferred bridge type will minimize long-term impacts with its long spans. After construction, wildlife will be free to roam the canyon in a manner very similar to today.
- Is there a plan to address the water runoff from the Basalt Creek Parkway Extension?
Yes. The project will adhere to the applicable stormwater codes. The stormwater will be treated and detained in accordance with federal, state and local requirements prior to discharging into the environment.
Contact(s)
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Capital Project Services
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