US Bridges

Road over Boulder Creek

Good

Whatcom County, Washington · 17.8 Miles East of SR 20 · Structure no. 060501000001513

Built
1993
32 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
297 ft
3 main spans
Daily traffic
382
1994 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over Boulder Creek is a prestressed concrete stringer/multi-beam or girder carrying Road over Boulder Creek in Whatcom County, Washington. It was built in 1993, so it is 32 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 382 vehicles a day, roughly 10% of them trucks, projected to reach 573 by 2045. The structure is 297 ft (90.5 m) long and 37 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesRoad
CrossesBoulder Creek
Location17.8 Miles East of SR 20
RouteFederal Lands Road 11000
Coordinates48.71656, -121.69427
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating64 US tons
Inventory rating39 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length297 ft (90.5 m)
Longest span102 ft (31.1 m)
Deck width37 ft (11.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic382 (1994)
Projected traffic573 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Road over Boulder Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Road over Boulder 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 November 2023.

How much traffic does Road over Boulder Creek carry?

About 382 vehicles per day (1994 count), of which roughly 10% are trucks.

How long is Road over Boulder Creek?

The structure is 297 ft (90.5 m) long with a longest span of 102 ft (31.1 m) and a deck 37 ft wide.

Who owns Road over Boulder Creek?

It is owned by the U.S. Forest Service.