US Bridges

IRR BIA RTE 100 over Nine Mile Creek

Fair

Ferry County, Washington · 6 KM NW of Nine Mile · Structure no. 00000000000P322

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
52 ft
2 main spans
Daily traffic
50
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 100 over Nine Mile Creek is a concrete stringer/multi-beam or girder carrying IRR BIA RTE 100 over Nine Mile Creek in Ferry 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 5 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2043. The structure is 52 ft (15.8 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesIRR BIA RTE 100
CrossesNine Mile Creek
Location6 KM NW of Nine Mile
RouteFederal Lands Road 100
Coordinates48.08454, -118.4675
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum 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 spans2
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span25 ft (7.6 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 100 over Nine Mile Creek built?

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

What condition is IRR BIA RTE 100 over Nine Mile 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 100 over Nine Mile Creek carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR BIA RTE 100 over Nine Mile Creek?

The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 27 ft wide.

Who owns IRR BIA RTE 100 over Nine Mile Creek?

It is owned by the Bureau of Indian Affairs.