US Bridges

US 93 over Snake River; Perrine Br.

Fair

Twin Falls County, Idaho · 0.6 N. Twin Falls · Structure no. 000000000017580

Built
1976
49 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Steel Continuous
Length
1,500 ft
1 main span
Daily traffic
31,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over Snake River; Perrine Br. is a steel continuous arch - deck carrying US 93 over Snake River; Perrine Br. in Twin Falls County, Idaho. It was built in 1976, so it is 49 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 6 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 31,500 vehicles a day, roughly 9% of them trucks, projected to reach 47,250 by 2042. The structure is 1,500 ft (457.2 m) long and 78 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesUS 93
CrossesSnake River; Perrine Br.
Location0.6 N. Twin Falls
RouteU.S. Route 93
CountyTwin Falls County
StateIdaho
Coordinates42.59842, -114.45436
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeArch - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length1,500 ft (457.2 m)
Longest span993 ft (302.7 m)
Deck width78 ft (23.9 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,500 (2023)
Projected traffic47,250 by 2042
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed16.8 mi (27 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$29.7 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 93 over Snake River; Perrine Br. built?

It was built in 1976, making it 49 years old in 2025.

What condition is US 93 over Snake River; Perrine 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 September 2024.

How much traffic does US 93 over Snake River; Perrine Br. carry?

About 31,500 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 93 over Snake River; Perrine Br.?

The structure is 1,500 ft (457.2 m) long with a longest span of 993 ft (302.7 m) and a deck 78 ft wide.

Who owns US 93 over Snake River; Perrine Br.?

It is owned by the State Highway Agency.