Lewis Creek
Lewis Creek runs beneath I-90, Southeast Newport Way and West Lake Sammamish Parkway Southeast near Lakemont Boulevard Southeast. It serves as a tributary to Lake Sammamish. The culverts under I-90 are completely impassable. The creek is home to chinook, coho and sockeye salmon and steelhead, sea-run cutthroat and resident trout. Replacing the existing culverts with new fish-passable structures will result in a potential habitat gain of 2.7 miles.
![Map showing the location of a fish barrier on Lewis Creek where it passes under I-90 near Issaquah](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/lewis-creek-project-area-map.png)
![Photo showing the interior of the existing culvert that carries Lewis Creek under I-90 near Issaquah](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/lewis-creek-culvert.jpg)
As part of this work, WSDOT will build a new roundabout on Southeast Newport Way and relocate the I-90 eastbound on-ramp. Work at this location is expected to last about two to three years.
![Map of anticipated traffic impacts due to phased construction for the Lewis Creek project](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/lewis-creek-graphic-map.jpg)
and relocate the I-90 eastbound on-ramp.
Expected traffic impacts due to phased construction
- I-90 – lane reductions
- Southeast Newport Way –lane reductions
- West Lake Sammamish Parkway Southeast – temporary full closure
West Village Park & Schneider Creeks
West Village Park Creek runs under I-90, Southeast Newport Way and West Lake Sammamish Parkway Southeast. As a tributary to Lake Sammamish, the West Village Park Creek is home to coho salmon, steelhead, sea-run cutthroat, and resident trout. The culvert carrying the creek is currently completely impassable. Fish barrier correction would result in a potential habitat gain of approximately one-half mile.
Schneider Creek is located near the west edge of Lake Sammamish State Park. The creek runs under I-90 and Northwest Sammamish Road. Schneider Creek is home to coho and sockeye salmon and steelhead, sea-run cutthroat, and resident trout. Fish barrier correction would result in a potential gain of approximately 0.7 miles of new habitat.
Construction of the new fish passable structures is expected to last up to three years.
![Map showing the location of fish barriers on West Village Park Creek and Schneider Creek near West Lake Sammamish Parkway Southeast](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/west-village-park-and-schneider-creeks-project-area-map.png)
West Lake Sammamish Parkway Southeast.
![Photo showing the culvert that carries West Village Park Creek under I-90 near Issaquah](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/west-village-park-culvert.jpg)
![Map of anticipated traffic impacts due to phased construction for the West Village Park & Schneider Creeks project](https://engage.wsdot.wa.gov/wp-content/uploads/2024/02/west-village-schneider-creek-map.jpg)
by rerouting West Village Park Creek into Schneider Creek.
Fish barrier correction will combine both creeks into one crossing location by rerouting West Village Park Creek into Schneider Creek. A new stream channel would be created along I-90 and within Sammamish Cove Park.
Expected traffic impacts due to phased construction
- I-90 – lane reductions
- Southeast Newport Way – temporary full closure
- Northwest Sammamish Road – temporary full closure
Unnamed Tributaries to Tibbetts Creek
The Unnamed Tributaries (UNTs) to Tibbetts Creek location is a collection of barriers near the interchange of I-90 and SR 900/17th Avenue Northwest. The Unnamed Tributaries to Tibbetts Creek run beneath I-90, an off-ramp and several on-ramps. The Unnamed Tributaries to Tibbetts Creek are home to coho and sockeye salmon and steelhead, sea-run cutthroat and resident trout.
Construction of the new fish passable structures is expected to last up to four years.
![Map showing the location of several fish barriers near the interchange of I-90 and SR 900/17th Avenue](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/unnamed-tributaries-to-tibbetts-creek-project-area-map.png)
![Map of anticipated construction impacts for the Unnamed Tributaries and Tibbetts Creek project](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/unts-graphic-map.jpg)
near the interchange of I-90 and SR 900/17th Avenue.
Construction of the 11 new fish passable structures is anticipated to last up to four years.
Expected construction impacts
- I-90 – lane reductions
- I-90 eastbound on-ramp – temporary full closure
- I-90 westbound off-ramp – temporary full closure
- I-90 westbound on-ramps – lane reductions
- Northwest Gilman Boulevard – lane reduction
Tibbetts Creek
Tibbetts Creek runs under SR 900 at milepost 19.5, north of Squak Mountain State Park. The existing culvert is considered one-third passable, making it difficult for coho and sockeye salmon and steelhead, sea-run cutthroat, and resident trout to successfully navigate up and downstream. Fish barrier correction would result in a potential habitat gain of more than one mile.
This work is expected to last up to one year.
![Map showing the location of the culvert carrying Tibbetts Creek under SR 900 near Squak Mountain](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/tibbetts-creek-project-area-map.png)
![Map showing anticipated construction impacts for the Tibbetts Creek project](https://engage.wsdot.wa.gov/wp-content/uploads/2024/01/sr-900-graphic-map.jpg)
Expected construction impacts
- SR 900 (Renton Issaquah Road Southeast) – temporary full closure