US Bridges

1000N-680E; Monroe over Blackfoot Canal

Fair

Bingham County, Idaho · 2.8 S. 2.0 W. Shelley · Structure no. 000000000022970

Built
1990
35 years old
Condition
Fair
inspected March 2023
Type
Channel Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
110
2023 count
Owner
County
County Highway Agency

About this bridge

1000N-680E; Monroe over Blackfoot Canal is a prestressed concrete channel beam carrying 1000N-680E; Monroe over Blackfoot Canal in Bingham County, Idaho. It was built in 1990, so it is 35 years old, younger 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 110 vehicles a day, roughly 10% of them trucks, projected to reach 165 by 2042. The structure is 30 ft (9.1 m) long and 18 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries1000N-680E; Monroe
CrossesBlackfoot Canal
Location2.8 S. 2.0 W. Shelley
RouteCounty Highway 0
CountyBingham County
StateIdaho
Coordinates43.3405, -112.16367
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width18 ft (5.4 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic165 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$353,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 1000N-680E; Monroe over Blackfoot Canal built?

It was built in 1990, making it 35 years old in 2025.

What condition is 1000N-680E; Monroe over Blackfoot 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 2023.

How much traffic does 1000N-680E; Monroe over Blackfoot Canal carry?

About 110 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 1000N-680E; Monroe over Blackfoot Canal?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 18 ft wide.

Who owns 1000N-680E; Monroe over Blackfoot Canal?

It is owned by the County Highway Agency.