US Bridges

North Fork RD SE over N Fork Snoqualmie River

Good

King County, Washington · 14.8 MI N of I-90 · Structure no. 087797000000000

Built
2008
17 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
175 ft
1 main span
Daily traffic
60
2020 count
Owner
County
County Highway Agency

About this bridge

North Fork RD SE over N Fork Snoqualmie River is a prestressed concrete stringer/multi-beam or girder carrying North Fork RD SE over N Fork Snoqualmie River in King County, Washington. It was built in 2008, so it is 17 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 60 vehicles a day, roughly 6% of them trucks, projected to reach 120 by 2040. The structure is 175 ft (53.3 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesNorth Fork RD SE
CrossesN Fork Snoqualmie River
Location14.8 MI N of I-90
RouteCounty Highway 87150
Coordinates47.64184, -121.68138
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.8 US tons
Inventory rating54.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length175 ft (53.3 m)
Longest span170 ft (51.8 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2020)
Projected traffic120 by 2040
Trucks6%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was North Fork RD SE over N Fork Snoqualmie River built?

It was built in 2008, making it 17 years old in 2025.

What condition is North Fork RD SE over N Fork Snoqualmie River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does North Fork RD SE over N Fork Snoqualmie River carry?

About 60 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is North Fork RD SE over N Fork Snoqualmie River?

The structure is 175 ft (53.3 m) long with a longest span of 170 ft (51.8 m) and a deck 20 ft wide.

Who owns North Fork RD SE over N Fork Snoqualmie River?

It is owned by the County Highway Agency.