US Bridges

So. Frontage RD over Weber Coulee

Good

Grant County, Washington · S Frontage 1.4 E of U SE · Structure no. 079917000000000

Built
1938
87 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Concrete
Length
108 ft
3 main spans
Daily traffic
66
2020 count
Owner
County
County Highway Agency

About this bridge

So. Frontage RD over Weber Coulee is a concrete tee beam carrying So. Frontage RD over Weber Coulee in Grant County, Washington. It was built in 1938, so it is 87 years old, older 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 66 vehicles a day, roughly 47% of them trucks, projected to reach 145 by 2042. The structure is 108 ft (32.9 m) long and 34 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesSo. Frontage RD
CrossesWeber Coulee
LocationS Frontage 1.4 E of U SE
RouteCounty Highway 22140
Coordinates47.08473, -119.01695
Functional classRural Minor Collector

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 protection7 GoodSome minor problems.
Last inspectionNovember 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating23.6 US tons
Inventory rating18.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length108 ft (32.9 m)
Longest span58 ft (17.7 m)
Deck width34 ft (10.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66 (2020)
Projected traffic145 by 2042
Trucks47%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was So. Frontage RD over Weber Coulee built?

It was built in 1938, making it 87 years old in 2025.

What condition is So. Frontage RD over Weber Coulee 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 November 2024.

How much traffic does So. Frontage RD over Weber Coulee carry?

About 66 vehicles per day (2020 count), of which roughly 47% are trucks.

How long is So. Frontage RD over Weber Coulee?

The structure is 108 ft (32.9 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.

Who owns So. Frontage RD over Weber Coulee?

It is owned by the County Highway Agency.