US Bridges

Tatman Mtn RD over Pataha Creek

Fair

Garfield County, Washington · .1 S JCT SR 12 · Structure no. 080217000000000

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
250
2020 count
Owner
County
County Highway Agency

About this bridge

Tatman Mtn RD over Pataha Creek is a prestressed concrete tee beam carrying Tatman Mtn RD over Pataha Creek in Garfield County, Washington. It was built in 1968, so it is 57 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 250 vehicles a day, roughly 5% of them trucks, projected to reach 320 by 2040. The structure is 45 ft (13.7 m) long and 31 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesTatman Mtn RD
CrossesPataha Creek
Location.1 S JCT SR 12
RouteCounty Highway 11500
Coordinates46.46183, -117.68986
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 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 rating45 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span43 ft (13.1 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2020)
Projected traffic320 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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$598,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Tatman Mtn RD over Pataha Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is Tatman Mtn RD 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 August 2024.

How much traffic does Tatman Mtn RD over Pataha Creek carry?

About 250 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Tatman Mtn RD over Pataha Creek?

The structure is 45 ft (13.7 m) long with a longest span of 43 ft (13.1 m) and a deck 31 ft wide.

Who owns Tatman Mtn RD over Pataha Creek?

It is owned by the County Highway Agency.