US Bridges

Robinson Fork Road over Robinson Fork

Good

Columbia County, Washington · 1.564 MI S RD#13890 · Structure no. 086401000000000

Built
1998
27 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
55 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 steel stringer/multi-beam or girder carrying Robinson Fork Road over Robinson Fork in Columbia County, Washington. It was built in 1998, so it is 27 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 30 by 2042. The structure is 55 ft (16.8 m) long and 16 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
Location1.564 MI S RD#13890
RouteCounty Highway 13730
CountyColumbia County
StateWashington
Coordinates46.21597, -117.89464
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
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span53 ft (16.2 m)
Deck width16 ft (5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2020)
Projected traffic30 by 2042
Trucks20%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Robinson Fork Road over Robinson Fork built?

It was built in 1998, making it 27 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 55 ft (16.8 m) long with a longest span of 53 ft (16.2 m) and a deck 16 ft wide.

Who owns Robinson Fork Road over Robinson Fork?

It is owned by the County Highway Agency.