US Bridges

US 89 over UPRR;12th St.;montpelier

Fair

Bear Lake County, Idaho · In Montpelier · Structure no. 000000000016705

Built
1971
54 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
720 ft
6 main spans
Daily traffic
4,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 over UPRR;12th St.;montpelier is a steel continuous box beam or girders - multiple carrying US 89 over UPRR;12th St.;montpelier in Bear Lake County, Idaho. It was built in 1971, so it is 54 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 4,800 vehicles a day, roughly 5% of them trucks, projected to reach 7,200 by 2042. The structure is 720 ft (219.5 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 89
CrossesUPRR;12th St.;montpelier
LocationIn Montpelier
RouteU.S. Route 89
CountyBear Lake County
StateIdaho
Coordinates42.31761, -111.31425
Functional classRural Principal Arterial - Other

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.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating47 US tons
Inventory rating28 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6 (+4 approach)
Design loadHS 20
Structure length720 ft (219.5 m)
Longest span92 ft (28 m)
Deck width36 ft (11.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,800 (2023)
Projected traffic7,200 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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$9.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 89 over UPRR;12th St.;montpelier built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 89 over UPRR;12th St.;montpelier 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 US 89 over UPRR;12th St.;montpelier carry?

About 4,800 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 89 over UPRR;12th St.;montpelier?

The structure is 720 ft (219.5 m) long with a longest span of 92 ft (28 m) and a deck 36 ft wide.

Who owns US 89 over UPRR;12th St.;montpelier?

It is owned by the State Highway Agency.