US Bridges

Duncan Creek Road over Duncan Creek

Good

Skamania County, Washington · 2.89 N JCT SR 14 · Structure no. 082716000000000

Built
1979
46 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
37
2023 count
Owner
County
County Highway Agency

About this bridge

Duncan Creek Road over Duncan Creek is a prestressed concrete tee beam carrying Duncan Creek Road over Duncan Creek in Skamania County, Washington. It was built in 1979, so it is 46 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 37 vehicles a day, roughly 9% of them trucks, projected to reach 25 by 2037. The structure is 39 ft (11.9 m) long and 28 ft wide.

CarriesDuncan Creek Road
CrossesDuncan Creek
Location2.89 N JCT SR 14
RouteCounty Highway 10110
Coordinates45.63667, -122.08667
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.7 US tons
Inventory rating22.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span33 ft (10.1 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37 (2023)
Projected traffic25 by 2037
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Duncan Creek Road over Duncan Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Duncan Creek Road over Duncan 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 2023.

How much traffic does Duncan Creek Road over Duncan Creek carry?

About 37 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Duncan Creek Road over Duncan Creek?

The structure is 39 ft (11.9 m) long with a longest span of 33 ft (10.1 m) and a deck 28 ft wide.

Who owns Duncan Creek Road over Duncan Creek?

It is owned by the County Highway Agency.