US Bridges

Road over Mill Creek

Good

Kittitas County, Washington · No Data Entered · Structure no. 061703000016349

Built
2012
13 years old
Condition
Good
inspected August 2024
Type
Truss - Thru
Steel
Length
61 ft
1 main span
Daily traffic
60
Owner
Federal
U.S. Forest Service

About this bridge

Road over Mill Creek is a steel truss - thru carrying Road over Mill Creek in Kittitas County, Washington. It was built in 2012, so it is 13 years old, younger 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 60 vehicles a day, projected to reach 90 by 2045. The structure is 61 ft (18.5 m) long and 14 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

CarriesRoad
CrossesMill Creek
LocationNo Data Entered
RouteFederal Lands Road 90700
Coordinates47.37216, -121.39824
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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.9 US tons
Inventory rating45 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 25 or greater
Structure length61 ft (18.5 m)
Longest span60 ft (18.3 m)
Deck width14 ft (4.2 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (—)
Projected traffic90 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 Mill Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is Road over Mill 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 August 2024.

How much traffic does Road over Mill Creek carry?

About 60 vehicles per day (latest count).

How long is Road over Mill Creek?

The structure is 61 ft (18.5 m) long with a longest span of 60 ft (18.3 m) and a deck 14 ft wide.

Who owns Road over Mill Creek?

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