US Bridges

SH 75 over Beaver Creek

Fair

Blaine County, Idaho · 11.6 S. Obsidian · Structure no. 000000000017725

Built
1974
51 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
800
2023 count
Owner
State
State Highway Agency

About this bridge

SH 75 over Beaver Creek is a prestressed concrete tee beam carrying SH 75 over Beaver Creek in Blaine 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 800 vehicles a day, roughly 16% of them trucks, projected to reach 1,200 by 2042. The structure is 28 ft (8.5 m) long and 41 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSH 75
CrossesBeaver Creek
Location11.6 S. Obsidian
RouteState Highway 75
CountyBlaine County
StateIdaho
Coordinates43.91944, -114.81428
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic1,200 by 2042
Trucks16%
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

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$455,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 75 over Beaver Creek built?

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

What condition is SH 75 over Beaver Creek 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 July 2024.

How much traffic does SH 75 over Beaver Creek carry?

About 800 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is SH 75 over Beaver Creek?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m) and a deck 41 ft wide.

Who owns SH 75 over Beaver Creek?

It is owned by the State Highway Agency.