US Bridges

SH 34 over Bear River;grace Bridge

Fair

Caribou County, Idaho · 0.6 N. Grace · Structure no. 000000000014020

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
541 ft
7 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

SH 34 over Bear River;grace Bridge is a prestressed concrete stringer/multi-beam or girder carrying SH 34 over Bear River;grace Bridge in Caribou County, Idaho. It was built in 1974, so it is 51 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 5 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 2,200 vehicles a day, roughly 11% of them trucks, projected to reach 3,300 by 2042. The structure is 541 ft (164.9 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSH 34
CrossesBear River;grace Bridge
Location0.6 N. Grace
RouteState Highway 34
CountyCaribou County
StateIdaho
Coordinates42.58553, -111.73042
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length541 ft (164.9 m)
Longest span75 ft (22.9 m)
Deck width52 ft (15.7 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic3,300 by 2042
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$8.5 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 34 over Bear River;grace Bridge built?

It was built in 1974, making it 51 years old in 2025.

What condition is SH 34 over Bear River;grace Bridge 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 April 2023.

How much traffic does SH 34 over Bear River;grace Bridge carry?

About 2,200 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is SH 34 over Bear River;grace Bridge?

The structure is 541 ft (164.9 m) long with a longest span of 75 ft (22.9 m) and a deck 52 ft wide.

Who owns SH 34 over Bear River;grace Bridge?

It is owned by the State Highway Agency.