US Bridges

US 30 over Snake River;gridley Br.

Fair

Gooding County, Idaho · 4.3 S. Hagerman · Structure no. 000000000013580

Built
1961
64 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
1,560 ft
39 main spans
Daily traffic
2,100
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over Snake River;gridley Br. is a concrete stringer/multi-beam or girder carrying US 30 over Snake River;gridley Br. in Gooding County, Idaho. It was built in 1961, so it is 64 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 2,100 vehicles a day, roughly 15% of them trucks, projected to reach 3,150 by 2042. The structure is 1,560 ft (475.5 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 30
CrossesSnake River;gridley Br.
Location4.3 S. Hagerman
RouteU.S. Route 30
CountyGooding County
StateIdaho
Coordinates42.75897, -114.87761
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
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 protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans39
Design loadHS 20
Structure length1,560 ft (475.5 m)
Longest span39 ft (11.9 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic3,150 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$15.4 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 30 over Snake River;gridley Br. built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 30 over Snake River;gridley 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 June 2023.

How much traffic does US 30 over Snake River;gridley Br. carry?

About 2,100 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 30 over Snake River;gridley Br.?

The structure is 1,560 ft (475.5 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns US 30 over Snake River;gridley Br.?

It is owned by the State Highway Agency.