US Bridges

STC2768;5250 E. RD over Snake River;milner Dam

Fair

Twin Falls County, Idaho · 2.5 N. 7.5 E. Murtaugh · Structure no. 000000000025365

Built
1986
39 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
275 ft
3 main spans
Daily traffic
360
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2768;5250 E. RD over Snake River;milner Dam is a prestressed concrete stringer/multi-beam or girder carrying STC2768;5250 E. RD over Snake River;milner Dam in Twin Falls County, Idaho. It was built in 1986, so it is 39 years old, younger 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 360 vehicles a day, roughly 9% of them trucks, projected to reach 540 by 2042. The structure is 275 ft (83.8 m) long and 34 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesSTC2768;5250 E. RD
CrossesSnake River;milner Dam
Location2.5 N. 7.5 E. Murtaugh
RouteCounty Highway 2768
CountyTwin Falls County
StateIdaho
Coordinates42.528, -114.01756
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating80 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length275 ft (83.8 m)
Longest span99 ft (30.2 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2023)
Projected traffic540 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2768;5250 E. RD over Snake River;milner Dam built?

It was built in 1986, making it 39 years old in 2025.

What condition is STC2768;5250 E. RD over Snake River;milner Dam 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 February 2023.

How much traffic does STC2768;5250 E. RD over Snake River;milner Dam carry?

About 360 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is STC2768;5250 E. RD over Snake River;milner Dam?

The structure is 275 ft (83.8 m) long with a longest span of 99 ft (30.2 m) and a deck 34 ft wide.

Who owns STC2768;5250 E. RD over Snake River;milner Dam?

It is owned by the Other Local Agency.