US Bridges

SH 25 over L Canal

Fair

Jerome County, Idaho · 7.0 E. Jerome · Structure no. 000000000013040

Built
1933
92 years old, rebuilt 1965
Condition
Fair
inspected March 2024
Type
Tee Beam
Concrete
Length
42 ft
1 main span
Daily traffic
1,200
2023 count
Owner
State
State Highway Agency

About this bridge

SH 25 over L Canal is a concrete tee beam carrying SH 25 over L Canal in Jerome County, Idaho. It was built in 1933 and reconstructed in 1965, so it is 92 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 1,200 vehicles a day, roughly 35% of them trucks, projected to reach 1,800 by 2042. The structure is 42 ft (12.8 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSH 25
CrossesL Canal
Location7.0 E. Jerome
RouteState Highway 25
CountyJerome County
StateIdaho
Coordinates42.69856, -114.39289
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length42 ft (12.8 m)
Longest span41 ft (12.5 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$530,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 25 over L Canal built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1965.

What condition is SH 25 over L 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 March 2024.

How much traffic does SH 25 over L Canal carry?

About 1,200 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is SH 25 over L Canal?

The structure is 42 ft (12.8 m) long with a longest span of 41 ft (12.5 m) and a deck 31 ft wide.

Who owns SH 25 over L Canal?

It is owned by the State Highway Agency.