US Bridges

Riverside Drive over Skagit River

Good

Skagit County, Washington · 0.7 N JCT SR 538 · Structure no. 087257000000000

Built
2004
21 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
850 ft
5 main spans
Daily traffic
21,640
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Riverside Drive over Skagit River is a prestressed concrete continuous stringer/multi-beam or girder carrying Riverside Drive over Skagit River in Skagit County, Washington. It was built in 2004, so it is 21 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 21,640 vehicles a day, roughly 5% of them trucks, projected to reach 39,084 by 2042. The structure is 850 ft (259.1 m) long and 72 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesRiverside Drive
CrossesSkagit River
Location0.7 N JCT SR 538
RouteCity Street 820
Coordinates48.44377, -122.33546
Functional classUrban Other Principal Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.7 US tons
Inventory rating50.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5 (+2 approach)
Design loadHS 25 or greater
Structure length850 ft (259.1 m)
Longest span180 ft (54.9 m)
Deck width72 ft (21.8 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,640 (2022)
Projected traffic39,084 by 2042
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25.4 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Riverside Drive over Skagit River built?

It was built in 2004, making it 21 years old in 2025.

What condition is Riverside Drive over Skagit 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 August 2023.

How much traffic does Riverside Drive over Skagit River carry?

About 21,640 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Riverside Drive over Skagit River?

The structure is 850 ft (259.1 m) long with a longest span of 180 ft (54.9 m) and a deck 72 ft wide.

Who owns Riverside Drive over Skagit River?

It is owned by the City or Municipal Highway Agency.