US Bridges

Grant Creek RD over Grant Creek

Good

Snohomish County, Washington · 0.7 NW JCT SR 530 · Structure no. 081047000000000

Built
1984
41 years old
Condition
Good
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
48 ft
1 main span
Daily traffic
59
2023 count
Owner
County
County Highway Agency

About this bridge

Grant Creek RD over Grant Creek is a prestressed concrete tee beam carrying Grant Creek RD over Grant Creek in Snohomish County, Washington. It was built in 1984, so it is 41 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 59 vehicles a day, roughly 5% of them trucks, projected to reach 100 by 2046. The structure is 48 ft (14.7 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesGrant Creek RD
CrossesGrant Creek
Location0.7 NW JCT SR 530
RouteCounty Highway 79780
Coordinates48.27531, -122.01301
Functional classRural Local

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length48 ft (14.7 m)
Longest span45 ft (13.7 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59 (2023)
Projected traffic100 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$2.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grant Creek RD over Grant Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Grant Creek RD over Grant Creek 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 July 2024.

How much traffic does Grant Creek RD over Grant Creek carry?

About 59 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Grant Creek RD over Grant Creek?

The structure is 48 ft (14.7 m) long with a longest span of 45 ft (13.7 m) and a deck 28 ft wide.

Who owns Grant Creek RD over Grant Creek?

It is owned by the County Highway Agency.