US Bridges

Two Mile Gulch over S.Fk.Cda R;two Mile Cr.

FairPosted for load

Shoshone County, Idaho · 0.4 N. 0.1 E. Osburn · Structure no. 000000000030980

Built
1966
59 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
98 ft
1 main span
Daily traffic
440
2023 count
Owner
County
County Highway Agency

About this bridge

Two Mile Gulch over S.Fk.Cda R;two Mile Cr. is a steel stringer/multi-beam or girder carrying Two Mile Gulch over S.Fk.Cda R;two Mile Cr. in Shoshone County, Idaho. It was built in 1966, so it is 59 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 440 vehicles a day, projected to reach 660 by 2042. The structure is 98 ft (29.9 m) long and 21 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTwo Mile Gulch
CrossesS.Fk.Cda R;two Mile Cr.
Location0.4 N. 0.1 E. Osburn
RouteCounty Highway 0
CountyShoshone County
StateIdaho
Coordinates47.50967, -115.9975
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length98 ft (29.9 m)
Longest span59 ft (18 m)
Deck width21 ft (6.5 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic440 (2023)
Projected traffic660 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Two Mile Gulch over S.Fk.Cda R;two Mile Cr. built?

It was built in 1966, making it 59 years old in 2025.

What condition is Two Mile Gulch over S.Fk.Cda R;two Mile Cr. 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 October 2024.

How much traffic does Two Mile Gulch over S.Fk.Cda R;two Mile Cr. carry?

About 440 vehicles per day (2023 count).

How long is Two Mile Gulch over S.Fk.Cda R;two Mile Cr.?

The structure is 98 ft (29.9 m) long with a longest span of 59 ft (18 m) and a deck 21 ft wide.

Who owns Two Mile Gulch over S.Fk.Cda R;two Mile Cr.?

It is owned by the County Highway Agency.