US Bridges

STC2781;1300 S. RD over Thorn Creek

PoorPosted for load

Gooding County, Idaho · 5.0 N. 5.1 E. Gooding · Structure no. 000000000019525

Built
1955
70 years old, rebuilt 1976
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
72 ft
3 main spans
Daily traffic
360
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2781;1300 S. RD over Thorn Creek is a steel stringer/multi-beam or girder carrying STC2781;1300 S. RD over Thorn Creek in Gooding County, Idaho. It was built in 1955 and reconstructed in 1976, so it is 70 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 2 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. Its operating status is: posted for load restriction.

It carries about 360 vehicles a day, roughly 29% of them trucks, projected to reach 540 by 2042. The structure is 72 ft (21.9 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSTC2781;1300 S. RD
CrossesThorn Creek
Location5.0 N. 5.1 E. Gooding
RouteCounty Highway 2781
StateIdaho
Coordinates43.01117, -114.61406
Functional classRural Major Collector

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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; extensive scour has occurred
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37 US tons
Inventory rating22 US tons

Structure

MaterialSteel
DeckClosed grating
Main spans3
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2023)
Projected traffic540 by 2042
Trucks29%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$714,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2781;1300 S. RD over Thorn Creek built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1976.

What condition is STC2781;1300 S. RD over Thorn Creek 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 March 2024.

How much traffic does STC2781;1300 S. RD over Thorn Creek carry?

About 360 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is STC2781;1300 S. RD over Thorn Creek?

The structure is 72 ft (21.9 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns STC2781;1300 S. RD over Thorn Creek?

It is owned by the Other Local Agency.