US Bridges

Sma 7611;W. Bridge over Snake River

Poor

Bingham County, Idaho · In Blackfoot;w.Bridge St. · Structure no. 000000000023120

Built
1936
89 years old, rebuilt 2011
Condition
Poor
inspected April 2024
Type
Truss - Thru
Steel
Length
483 ft
2 main spans
Daily traffic
6,900
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sma 7611;W. Bridge over Snake River is a steel truss - thru carrying Sma 7611;W. Bridge over Snake River in Bingham County, Idaho. It was built in 1936 and reconstructed in 2011, so it is 89 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,900 vehicles a day, projected to reach 10,350 by 2042. The structure is 483 ft (147.2 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSma 7611;W. Bridge
CrossesSnake River
LocationIn Blackfoot;w.Bridge St.
RouteCity Street 7611
StateIdaho
Coordinates43.19822, -112.37058
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating51 US tons
Inventory rating31 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length483 ft (147.2 m)
Longest span210 ft (64 m)
Deck width33 ft (10.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck15 ft (4.5 m)

Traffic and service

Average daily traffic6,900 (2023)
Projected traffic10,350 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$18.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Sma 7611;W. Bridge over Snake River built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2011.

What condition is Sma 7611;W. Bridge over Snake River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.

How much traffic does Sma 7611;W. Bridge over Snake River carry?

About 6,900 vehicles per day (2023 count).

How long is Sma 7611;W. Bridge over Snake River?

The structure is 483 ft (147.2 m) long with a longest span of 210 ft (64 m) and a deck 33 ft wide.

Who owns Sma 7611;W. Bridge over Snake River?

It is owned by the City or Municipal Highway Agency.