US Bridges

18 TH Street over Pataha Creek

Fair

Garfield County, Washington · 0.1 S US12 on 18th · Structure no. 085569000000000

Built
1960
65 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
36 ft
1 main span
Daily traffic
200
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

18 TH Street over Pataha Creek is a steel stringer/multi-beam or girder carrying 18 TH Street over Pataha Creek in Garfield County, Washington. It was built in 1960, so it is 65 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 5 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 200 vehicles a day, roughly 5% of them trucks, projected to reach 220 by 2040. The structure is 36 ft (11 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries18 TH Street
CrossesPataha Creek
Location0.1 S US12 on 18th
RouteCity Street 18
Coordinates46.47206, -117.58572
Functional classRural Local

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 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 rating45 US tons
Inventory rating27 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length36 ft (11 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2020)
Projected traffic220 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$547,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 18 TH Street over Pataha Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is 18 TH Street over Pataha 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 18 TH Street over Pataha Creek carry?

About 200 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 18 TH Street over Pataha Creek?

The structure is 36 ft (11 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns 18 TH Street over Pataha Creek?

It is owned by the City or Municipal Highway Agency.