US Bridges

US 30 over Deer Crossing

Fair

Bannock County, Idaho · 2.5 E. Lava Hot Springs · Structure no. 000000000013725

Built
1977
48 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
4,300
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over Deer Crossing is a prestressed concrete stringer/multi-beam or girder carrying US 30 over Deer Crossing in Bannock County, Idaho. It was built in 1977, so it is 48 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 4,300 vehicles a day, roughly 20% of them trucks, projected to reach 6,450 by 2042. The structure is 76 ft (23.2 m) long and 54 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesUS 30
CrossesDeer Crossing
Location2.5 E. Lava Hot Springs
RouteU.S. Route 30
CountyBannock County
StateIdaho
Coordinates42.61758, -111.97286
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span75 ft (22.9 m)
Deck width54 ft (16.4 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,300 (2023)
Projected traffic6,450 by 2042
Trucks20%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed11.8 mi (19 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 30 over Deer Crossing built?

It was built in 1977, making it 48 years old in 2025.

What condition is US 30 over Deer Crossing 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 October 2024.

How much traffic does US 30 over Deer Crossing carry?

About 4,300 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is US 30 over Deer Crossing?

The structure is 76 ft (23.2 m) long with a longest span of 75 ft (22.9 m) and a deck 54 ft wide.

Who owns US 30 over Deer Crossing?

It is owned by the State Highway Agency.