US Bridges

Rd. 31. MP 7.1 over Kidney Creek

Fair

Whatcom County, Washington · 7.1 Miles from SH 542 · Structure no. 060501000001429

Built
1953
72 years old
Condition
Fair
inspected September 2024
Type
Frame
Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
73
1996 count
Owner
Federal
U.S. Forest Service

About this bridge

Rd. 31. MP 7.1 over Kidney Creek is a concrete continuous frame carrying Rd. 31. MP 7.1 over Kidney Creek in Whatcom County, Washington. It was built in 1953, so it is 72 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 73 vehicles a day, projected to reach 109 by 2045. The structure is 103 ft (31.4 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesRd. 31. MP 7.1
CrossesKidney Creek
Location7.1 Miles from SH 542
RouteFederal Lands Road 31000
CountyWhatcom County
StateWashington
Coordinates48.94847, -121.93355
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length103 ft (31.4 m)
Longest span65 ft (19.8 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73 (1996)
Projected traffic109 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-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 Rd. 31. MP 7.1 over Kidney Creek built?

It was built in 1953, making it 72 years old in 2025.

What condition is Rd. 31. MP 7.1 over Kidney Creek 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 September 2024.

How much traffic does Rd. 31. MP 7.1 over Kidney Creek carry?

About 73 vehicles per day (1996 count).

How long is Rd. 31. MP 7.1 over Kidney Creek?

The structure is 103 ft (31.4 m) long with a longest span of 65 ft (19.8 m) and a deck 16 ft wide.

Who owns Rd. 31. MP 7.1 over Kidney Creek?

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