US Bridges

Road over W Fk Miller River

Good

King County, Washington · 3.8 MI S of 6410/OLD HWY · Structure no. 060506000001328

Built
1961
64 years old, rebuilt 2010
Condition
Good
inspected October 2022
Type
Frame
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
44
1992 count
Owner
Federal
U.S. Forest Service

About this bridge

Road over W Fk Miller River is a concrete continuous frame carrying Road over W Fk Miller River in King County, Washington. It was built in 1961 and reconstructed in 2010, so it is 64 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 44 vehicles a day, projected to reach 66 by 2045. The structure is 102 ft (31.1 m) long and 17 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesRoad
CrossesW Fk Miller River
Location3.8 MI S of 6410/OLD HWY
RouteFederal Lands Road 64120
Coordinates47.67125, -121.39268
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating48.1 US tons
Inventory rating33.1 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length102 ft (31.1 m)
Longest span68 ft (20.7 m)
Deck width17 ft (5.2 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44 (1992)
Projected traffic66 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 Road over W Fk Miller River built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2010.

What condition is Road over W Fk Miller River 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 October 2022.

How much traffic does Road over W Fk Miller River carry?

About 44 vehicles per day (1992 count).

How long is Road over W Fk Miller River?

The structure is 102 ft (31.1 m) long with a longest span of 68 ft (20.7 m) and a deck 17 ft wide.

Who owns Road over W Fk Miller River?

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