US Bridges

Coltman Rd;e 129 N over S.Branch Harrison Canal

Fair

Bonneville County, Idaho · 1.0 S. 4.7 W. Ririe · Structure no. 000000000031135

Built
1957
68 years old
Condition
Fair
inspected November 2023
Type
Frame
Concrete
Length
22 ft
1 main span
Daily traffic
230
2023 count
Owner
County
County Highway Agency

About this bridge

Coltman Rd;e 129 N over S.Branch Harrison Canal is a concrete frame carrying Coltman Rd;e 129 N over S.Branch Harrison Canal in Bonneville County, Idaho. It was built in 1957, so it is 68 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 230 vehicles a day, roughly 35% of them trucks, projected to reach 345 by 2042. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesColtman Rd;e 129 N
CrossesS.Branch Harrison Canal
Location1.0 S. 4.7 W. Ririe
RouteCounty Highway 0
CountyBonneville County
StateIdaho
Coordinates43.61253, -111.87256
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span22 ft (6.7 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2023)
Projected traffic345 by 2042
Trucks35%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$312,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Coltman Rd;e 129 N over S.Branch Harrison Canal built?

It was built in 1957, making it 68 years old in 2025.

What condition is Coltman Rd;e 129 N over S.Branch Harrison Canal 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 November 2023.

How much traffic does Coltman Rd;e 129 N over S.Branch Harrison Canal carry?

About 230 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is Coltman Rd;e 129 N over S.Branch Harrison Canal?

The structure is 22 ft (6.7 m) long with a longest span of 22 ft (6.7 m) and a deck 30 ft wide.

Who owns Coltman Rd;e 129 N over S.Branch Harrison Canal?

It is owned by the County Highway Agency.