US Bridges

Robinson Fork Road over Robinson Fork

Good

Columbia County, Washington · 0.6 S JCT 13890 · Structure no. 086108000000000

Built
1995
30 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
25
2020 count
Owner
County
County Highway Agency

About this bridge

Robinson Fork Road over Robinson Fork is a prestressed concrete stringer/multi-beam or girder carrying Robinson Fork Road over Robinson Fork in Columbia County, Washington. It was built in 1995, so it is 30 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 25 vehicles a day, roughly 20% of them trucks, projected to reach 35 by 2042. The structure is 56 ft (17.1 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesRobinson Fork Road
CrossesRobinson Fork
Location0.6 S JCT 13890
RouteCounty Highway 13730
CountyColumbia County
StateWashington
Coordinates46.22881, -117.89317
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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span55 ft (16.8 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2020)
Projected traffic35 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$692,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Robinson Fork Road over Robinson Fork built?

It was built in 1995, making it 30 years old in 2025.

What condition is Robinson Fork Road over Robinson Fork 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 2024.

How much traffic does Robinson Fork Road over Robinson Fork carry?

About 25 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Robinson Fork Road over Robinson Fork?

The structure is 56 ft (17.1 m) long with a longest span of 55 ft (16.8 m) and a deck 25 ft wide.

Who owns Robinson Fork Road over Robinson Fork?

It is owned by the County Highway Agency.