Skip to main content

Project overview

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
This map shows the location of a fish barrier on Lewis Creek where it passes under I-90 near Issaquah.
Photo showing the interior of the existing culvert that carries Lewis Creek under I-90 near Issaquah
This photo shows the interior of the existing culvert that carries Lewis Creek under I-90 near Issaquah.

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
This map shows where WSDOT will build a new roundabout on Southeast Newport Way
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
This map shows the location of fish barriers on West Village Park Creek and Schneider Creek near
West Lake Sammamish Parkway Southeast.
Photo showing the culvert that carries West Village Park Creek under I-90 near Issaquah
This photo shows the culvert that carries West Village Park Creek beneath I-90 near Issaquah.
Map of anticipated traffic impacts due to phased construction for the West Village Park & Schneider Creeks project
This map shows where WSDOT will combine both creeks into one crossing location
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
This map shows the location of fish barrier corrections near the interchange of I-90 and SR 900/17th Avenue.
Map of anticipated construction impacts for the Unnamed Tributaries and Tibbetts Creek project
This map shows where WSDOT will build 11 new fish passable structures
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
This map shows the location of the fish barrier correction at SR 900 Tibbetts Creek near Squak Mountain.
Map showing anticipated construction impacts for the Tibbetts Creek project
This map shows where WSDOT will build a new fish passable structure at SR 900 near Squak Mountain

Expected construction impacts

  • SR 900 (Renton Issaquah Road Southeast) – temporary full closure