US Bridges

Patit Road over Patit Creek

Fair

Columbia County, Washington · 1.5 Miles West of SR12 · Structure no. 087051000000000

Built
2002
23 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
600
2020 count
Owner
County
County Highway Agency

About this bridge

Patit Road over Patit Creek is a prestressed concrete tee beam carrying Patit Road over Patit Creek in Columbia County, Washington. It was built in 2002, so it is 23 years old, younger 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 600 vehicles a day, roughly 18% of them trucks, projected to reach 850 by 2042. The structure is 81 ft (24.7 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesPatit Road
CrossesPatit Creek
Location1.5 Miles West of SR12
RouteCounty Highway 91320
CountyColumbia County
StateWashington
Coordinates46.34008, -117.95214
Functional classRural Major Collector

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.
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 evaluation6: Equal to 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 rating69.7 US tons
Inventory rating53.6 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length81 ft (24.7 m)
Longest span76 ft (23.3 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2020)
Projected traffic850 by 2042
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Patit Road over Patit Creek built?

It was built in 2002, making it 23 years old in 2025.

What condition is Patit Road over Patit Creek 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 October 2024.

How much traffic does Patit Road over Patit Creek carry?

About 600 vehicles per day (2020 count), of which roughly 18% are trucks.

How long is Patit Road over Patit Creek?

The structure is 81 ft (24.7 m) long with a longest span of 76 ft (23.3 m) and a deck 32 ft wide.

Who owns Patit Road over Patit Creek?

It is owned by the County Highway Agency.