US Bridges

US 89 over ST Charles Cr.;s.Branch

Fair

Bear Lake County, Idaho · In ST Charles · Structure no. 000000000016670

Built
1956
69 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
1,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 over ST Charles Cr.;s.Branch is a concrete tee beam carrying US 89 over ST Charles Cr.;s.Branch in Bear Lake County, Idaho. It was built in 1956, so it is 69 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 17% of them trucks, projected to reach 1,800 by 2042. The structure is 30 ft (9.1 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS 89
CrossesST Charles Cr.;s.Branch
LocationIn ST Charles
RouteU.S. Route 89
CountyBear Lake County
StateIdaho
Coordinates42.11839, -111.38906
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 89 over ST Charles Cr.;s.Branch built?

It was built in 1956, making it 69 years old in 2025.

What condition is US 89 over ST Charles Cr.;s.Branch 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 August 2023.

How much traffic does US 89 over ST Charles Cr.;s.Branch carry?

About 1,200 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US 89 over ST Charles Cr.;s.Branch?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 36 ft wide.

Who owns US 89 over ST Charles Cr.;s.Branch?

It is owned by the State Highway Agency.