US Bridges

Jw Mann Road over Skykomish River

Fair

Snohomish County, Washington · 0.1 S JCT SR 2 · Structure no. 080375000000000

Built
1961
64 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
470 ft
3 main spans
Daily traffic
1,321
2023 count
Owner
County
County Highway Agency

About this bridge

Jw Mann Road over Skykomish River is a steel continuous stringer/multi-beam or girder carrying Jw Mann Road over Skykomish River in Snohomish County, Washington. It was built in 1961, so it is 64 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,321 vehicles a day, roughly 12% of them trucks, projected to reach 3,000 by 2042. The structure is 470 ft (143.2 m) long and 31 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesJw Mann Road
CrossesSkykomish River
Location0.1 S JCT SR 2
RouteCounty Highway 95776
CountySnohomish County
StateWashington
Coordinates47.85996, -121.81496
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating20 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length470 ft (143.2 m)
Longest span150 ft (45.7 m)
Deck width31 ft (9.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,321 (2023)
Projected traffic3,000 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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$17.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Jw Mann Road over Skykomish River built?

It was built in 1961, making it 64 years old in 2025.

What condition is Jw Mann Road over Skykomish River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does Jw Mann Road over Skykomish River carry?

About 1,321 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Jw Mann Road over Skykomish River?

The structure is 470 ft (143.2 m) long with a longest span of 150 ft (45.7 m) and a deck 31 ft wide.

Who owns Jw Mann Road over Skykomish River?

It is owned by the County Highway Agency.