US Bridges

SR 14 over Duncan CR

Fair

Skamania County, Washington · 11.1 E Clark CO · Structure no. 0001047A0000000

Built
1926
99 years old
Condition
Fair
inspected April 2024
Type
Girder and Floorbeam System
Concrete
Length
44 ft
1 main span
Daily traffic
4,755
2023 count
Owner
State
State Highway Agency

About this bridge

SR 14 over Duncan CR is a concrete girder and floorbeam system carrying SR 14 over Duncan CR in Skamania County, Washington. It was built in 1926, so it is 99 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 6 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 4,755 vehicles a day, roughly 9% of them trucks, projected to reach 6,092 by 2039. The structure is 44 ft (13.4 m) long and 29 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 14
CrossesDuncan CR
Location11.1 E Clark CO
RouteState Highway 14
CountySkamania County
StateWashington
Coordinates45.61321, -122.05502
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,755 (2023)
Projected traffic6,092 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$711,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 14 over Duncan CR built?

It was built in 1926, making it 99 years old in 2025.

What condition is SR 14 over Duncan CR 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 April 2024.

How much traffic does SR 14 over Duncan CR carry?

About 4,755 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 14 over Duncan CR?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 29 ft wide.

Who owns SR 14 over Duncan CR?

It is owned by the State Highway Agency.