US Bridges

Old HWY 99 North over Samish River

FairPosted for load

Skagit County, Washington · 2.6 N JCT Cook Rd. · Structure no. 080501000000000

Built
1934
91 years old
Condition
Fair
inspected March 2024
Type
Truss - Thru
Steel
Length
385 ft
1 main span
Daily traffic
3,113
2022 count
Owner
County
County Highway Agency

About this bridge

Old HWY 99 North over Samish River is a steel truss - thru carrying Old HWY 99 North over Samish River in Skagit County, Washington. It was built in 1934, so it is 91 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. Its operating status is: posted for load restriction.

It carries about 3,113 vehicles a day, roughly 11% of them trucks, projected to reach 5,622 by 2042. The structure is 385 ft (117.3 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesOld HWY 99 North
CrossesSamish River
Location2.6 N JCT Cook Rd.
RouteCounty Highway 50510
CountySkagit County
StateWashington
Coordinates48.54579, -122.33814
Functional classRural Major 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.3 US tons
Inventory rating17.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+8 approach)
Design loadH 15
Structure length385 ft (117.3 m)
Longest span142 ft (43.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic3,113 (2022)
Projected traffic5,622 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old HWY 99 North over Samish River built?

It was built in 1934, making it 91 years old in 2025.

What condition is Old HWY 99 North over Samish 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 March 2024.

How much traffic does Old HWY 99 North over Samish River carry?

About 3,113 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Old HWY 99 North over Samish River?

The structure is 385 ft (117.3 m) long with a longest span of 142 ft (43.3 m) and a deck 26 ft wide.

Who owns Old HWY 99 North over Samish River?

It is owned by the County Highway Agency.