US Bridges

Patit Road over Patit Creek

Fair

Columbia County, Washington · 0.2 E JCT 9132 · Structure no. 081990000000000

Built
1971
54 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
275
2019 count
Owner
County
County Highway Agency

About this bridge

Patit Road over Patit Creek is a steel stringer/multi-beam or girder carrying Patit Road over Patit Creek in Columbia County, Washington. It was built in 1971, so it is 54 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 275 vehicles a day, roughly 15% of them trucks, projected to reach 500 by 2041. The structure is 24 ft (7.3 m) long and 29 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesPatit Road
CrossesPatit Creek
Location0.2 E JCT 9132
RouteCounty Highway 91320
CountyColumbia County
StateWashington
Coordinates46.34102, -117.81389
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2019)
Projected traffic500 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$251,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Patit Road over Patit Creek built?

It was built in 1971, making it 54 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 2023.

How much traffic does Patit Road over Patit Creek carry?

About 275 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is Patit Road over Patit Creek?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.

Who owns Patit Road over Patit Creek?

It is owned by the County Highway Agency.