US Bridges

Eightmile Road over Eightmile Creek

Good

Okanogan County, Washington · No Data Entered · Structure no. 060805000001005

Built
1949
76 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
97
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Eightmile Road over Eightmile Creek is a concrete continuous stringer/multi-beam or girder carrying Eightmile Road over Eightmile Creek in Okanogan County, Washington. It was built in 1949, so it is 76 years old, older 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 97 vehicles a day, projected to reach 145 by 2045. The structure is 122 ft (37.2 m) long and 17 ft wide. If it were closed, the detour would be 25.5 mi (41 km).

CarriesEightmile Road
CrossesEightmile Creek
LocationNo Data Entered
RouteFederal Lands Road 51300
Coordinates48.61164, -120.19074
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 inspectionJune 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.1 US tons
Inventory rating22.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length122 ft (37.2 m)
Longest span56 ft (17.1 m)
Deck width17 ft (5.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97 (1992)
Projected traffic145 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed25.5 mi (41 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 Eightmile Road over Eightmile Creek built?

It was built in 1949, making it 76 years old in 2025.

What condition is Eightmile Road over Eightmile 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 June 2024.

How much traffic does Eightmile Road over Eightmile Creek carry?

About 97 vehicles per day (1992 count).

How long is Eightmile Road over Eightmile Creek?

The structure is 122 ft (37.2 m) long with a longest span of 56 ft (17.1 m) and a deck 17 ft wide.

Who owns Eightmile Road over Eightmile Creek?

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