US Bridges

Stc 1775;TURNER RD over Bear R.;grace-Turner Br.

FairPosted for load

Caribou County, Idaho · 0.6 W. Grace · Structure no. 000000000019170

Built
1955
70 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
304 ft
2 main spans
Daily traffic
350
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 1775;TURNER RD over Bear R.;grace-Turner Br. is a steel stringer/multi-beam or girder carrying Stc 1775;TURNER RD over Bear R.;grace-Turner Br. in Caribou County, Idaho. It was built in 1955, so it is 70 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. Its operating status is: posted for load restriction.

It carries about 350 vehicles a day, roughly 13% of them trucks, projected to reach 525 by 2042. The structure is 304 ft (92.7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStc 1775;TURNER RD
CrossesBear R.;grace-Turner Br.
Location0.6 W. Grace
RouteCounty Highway 1775
CountyCaribou County
StateIdaho
Coordinates42.57656, -111.75144
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29 US tons
Inventory rating17 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadH 15
Structure length304 ft (92.7 m)
Longest span120 ft (36.6 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2023)
Projected traffic525 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$2.4 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 1775;TURNER RD over Bear R.;grace-Turner Br. built?

It was built in 1955, making it 70 years old in 2025.

What condition is Stc 1775;TURNER RD over Bear R.;grace-Turner Br. 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 2024.

How much traffic does Stc 1775;TURNER RD over Bear R.;grace-Turner Br. carry?

About 350 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Stc 1775;TURNER RD over Bear R.;grace-Turner Br.?

The structure is 304 ft (92.7 m) long with a longest span of 120 ft (36.6 m) and a deck 28 ft wide.

Who owns Stc 1775;TURNER RD over Bear R.;grace-Turner Br.?

It is owned by the County Highway Agency.