US Bridges

SR 522 over North CR & Gillman Trail

Good

King County, Washington · 5.9 E JCT SR 104 · Structure no. 0008257B0000000

Built
1968
57 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
140 ft
3 main spans
Daily traffic
11,919
2023 count
Owner
State
State Highway Agency

About this bridge

SR 522 over North CR & Gillman Trail is a concrete continuous slab carrying SR 522 over North CR & Gillman Trail in King County, Washington. It was built in 1968, so it is 57 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,919 vehicles a day, roughly 5% of them trucks, projected to reach 17,414 by 2039. The structure is 140 ft (42.7 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 522
CrossesNorth CR & Gillman Trail
Location5.9 E JCT SR 104
RouteState Highway 522
Coordinates47.75672, -122.18889
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length140 ft (42.7 m)
Longest span56 ft (17.1 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,919 (2023)
Projected traffic17,414 by 2039
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 522 over North CR & Gillman Trail built?

It was built in 1968, making it 57 years old in 2025.

What condition is SR 522 over North CR & Gillman Trail 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 2023.

How much traffic does SR 522 over North CR & Gillman Trail carry?

About 11,919 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 522 over North CR & Gillman Trail?

The structure is 140 ft (42.7 m) long with a longest span of 56 ft (17.1 m) and a deck 48 ft wide.

Who owns SR 522 over North CR & Gillman Trail?

It is owned by the State Highway Agency.