US Bridges

IRR BIA RTE 56 over North Star Creek

Fair

Okanogan County, Washington · 16 KM North of Nespelem · Structure no. 00000000000P303

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
27 ft
1 main span
Daily traffic
25
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 56 over North Star Creek is a concrete stringer/multi-beam or girder carrying IRR BIA RTE 56 over North Star Creek in Okanogan County, Washington. It was built in 1962, so it is 63 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 25 vehicles a day, roughly 30% of them trucks, projected to reach 50 by 2043. The structure is 27 ft (8.3 m) long and 17 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIRR BIA RTE 56
CrossesNorth Star Creek
Location16 KM North of Nespelem
RouteFederal Lands Road 56
Coordinates48.29984, -118.96563
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.9 US tons
Inventory rating27 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length27 ft (8.3 m)
Longest span25 ft (7.6 m)
Deck width17 ft (5.1 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic50 by 2043
Trucks30%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 56 over North Star Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is IRR BIA RTE 56 over North Star 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 June 2023.

How much traffic does IRR BIA RTE 56 over North Star Creek carry?

About 25 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is IRR BIA RTE 56 over North Star Creek?

The structure is 27 ft (8.3 m) long with a longest span of 25 ft (7.6 m) and a deck 17 ft wide.

Who owns IRR BIA RTE 56 over North Star Creek?

It is owned by the Bureau of Indian Affairs.