US Bridges

NE 124th ST over Snoqualmie River

Good

King County, Washington · 0.5 MI W of SR 203 · Structure no. 086513000000000

Built
2000
25 years old
Condition
Good
inspected April 2023
Type
Arch - Thru
Steel
Length
624 ft
1 main span
Daily traffic
12,222
2020 count
Owner
County
County Highway Agency

About this bridge

NE 124th ST over Snoqualmie River is a steel arch - thru carrying NE 124th ST over Snoqualmie River in King County, Washington. It was built in 2000, so it is 25 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 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 12,222 vehicles a day, roughly 5% of them trucks, projected to reach 13,500 by 2042. The structure is 624 ft (190.2 m) long and 47 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesNE 124th ST
CrossesSnoqualmie River
Location0.5 MI W of SR 203
RouteCounty Highway 88600
Coordinates47.70898, -121.99675
Functional classRural Major Collector

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 25 or greater
Structure length624 ft (190.2 m)
Longest span295 ft (89.9 m)
Deck width47 ft (14.4 m)
Roadway width39 ft (12 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic12,222 (2020)
Projected traffic13,500 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$22.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NE 124th ST over Snoqualmie River built?

It was built in 2000, making it 25 years old in 2025.

What condition is NE 124th ST over 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 April 2023.

How much traffic does NE 124th ST over Snoqualmie River carry?

About 12,222 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is NE 124th ST over Snoqualmie River?

The structure is 624 ft (190.2 m) long with a longest span of 295 ft (89.9 m) and a deck 47 ft wide.

Who owns NE 124th ST over Snoqualmie River?

It is owned by the County Highway Agency.