US Bridges

First ST over Bear Creek;nw.Calder Br

Fair

Shoshone County, Idaho · 0.1 N. 0.1 W. Calder · Structure no. 000000000030850

Built
1960
65 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

First ST over Bear Creek;nw.Calder Br is a steel stringer/multi-beam or girder carrying First ST over Bear Creek;nw.Calder Br in Shoshone County, Idaho. It was built in 1960, so it is 65 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2039. The structure is 37 ft (11.3 m) long and 21 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesFirst ST
CrossesBear Creek;nw.Calder Br
Location0.1 N. 0.1 W. Calder
RouteCounty Highway 0
CountyShoshone County
StateIdaho
Coordinates47.27683, -116.19108
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span36 ft (11 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$409,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was First ST over Bear Creek;nw.Calder Br built?

It was built in 1960, making it 65 years old in 2025.

What condition is First ST over Bear Creek;nw.Calder 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 August 2023.

How much traffic does First ST over Bear Creek;nw.Calder Br carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is First ST over Bear Creek;nw.Calder Br?

The structure is 37 ft (11.3 m) long with a longest span of 36 ft (11 m) and a deck 21 ft wide.

Who owns First ST over Bear Creek;nw.Calder Br?

It is owned by the County Highway Agency.