US Bridges

STC2781;4 Mile RD over Milner Gooding Canal

Fair

Lincoln County, Idaho · 4.3 N. 2.3 W. Shoshone · Structure no. 000000000025115

Built
1965
60 years old
Condition
Fair
inspected March 2023
Type
Frame
Concrete Continuous
Length
50 ft
3 main spans
Daily traffic
1,200
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2781;4 Mile RD over Milner Gooding Canal is a concrete continuous frame carrying STC2781;4 Mile RD over Milner Gooding Canal in Lincoln County, Idaho. It was built in 1965, so it is 60 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 1,200 vehicles a day, roughly 21% of them trucks, projected to reach 1,800 by 2042. The structure is 50 ft (15.2 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSTC2781;4 Mile RD
CrossesMilner Gooding Canal
Location4.3 N. 2.3 W. Shoshone
RouteCounty Highway 2781
CountyLincoln County
StateIdaho
Coordinates42.99647, -114.44133
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeFrame
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length50 ft (15.2 m)
Longest span16 ft (4.9 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks21%
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

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$780,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2781;4 Mile RD over Milner Gooding Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is STC2781;4 Mile RD over Milner Gooding Canal 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 March 2023.

How much traffic does STC2781;4 Mile RD over Milner Gooding Canal carry?

About 1,200 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is STC2781;4 Mile RD over Milner Gooding Canal?

The structure is 50 ft (15.2 m) long with a longest span of 16 ft (4.9 m) and a deck 31 ft wide.

Who owns STC2781;4 Mile RD over Milner Gooding Canal?

It is owned by the Other Local Agency.