US Bridges

Jackson Road over Mann Creek

Fair

Washington County, Idaho · 7.4 N. 4.8 E. Weiser · Structure no. 000000000028755

Built
1973
52 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
90
2023 count
Owner
County
County Highway Agency

About this bridge

Jackson Road over Mann Creek is a prestressed concrete tee beam carrying Jackson Road over Mann Creek in Washington County, Idaho. It was built in 1973, so it is 52 years old, older than the Idaho average of 45.3 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 90 vehicles a day, roughly 10% of them trucks, projected to reach 135 by 2039. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesJackson Road
CrossesMann Creek
Location7.4 N. 4.8 E. Weiser
RouteCounty Highway 0
CountyWashington County
StateIdaho
Coordinates44.35422, -116.87603
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating56 US tons
Inventory rating40 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic90 (2023)
Projected traffic135 by 2039
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Jackson Road over Mann Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is Jackson Road over Mann 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 July 2023.

How much traffic does Jackson Road over Mann Creek carry?

About 90 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Jackson Road over Mann Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns Jackson Road over Mann Creek?

It is owned by the County Highway Agency.