US Bridges

Line Creek Road over Stormcastle Creek

Fair

Gallatin County, Montana · Off Sq___ Creek Road · Structure no. 011106000000097

Built
1948
77 years old, rebuilt 1975
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
50
1993 count
Owner
Federal
U.S. Forest Service

About this bridge

Line Creek Road over Stormcastle Creek is a wood or timber stringer/multi-beam or girder carrying Line Creek Road over Stormcastle Creek in Gallatin County, Montana. It was built in 1948 and reconstructed in 1975, so it is 77 years old, older than the Montana average of 47 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.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 31 ft (9.3 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
CarriesLine Creek Road
CrossesStormcastle Creek
LocationOff Sq___ Creek Road
RouteFederal Lands Road 3108
CountyGallatin County
StateMontana
Coordinates45.42306, -111.12001
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating72.1 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length31 ft (9.3 m)
Longest span29 ft (8.8 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1993)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Line Creek Road over Stormcastle Creek built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1975.

What condition is Line Creek Road over Stormcastle Creek 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 2023.

How much traffic does Line Creek Road over Stormcastle Creek carry?

About 50 vehicles per day (1993 count).

How long is Line Creek Road over Stormcastle Creek?

The structure is 31 ft (9.3 m) long with a longest span of 29 ft (8.8 m) and a deck 15 ft wide.

Who owns Line Creek Road over Stormcastle Creek?

It is owned by the U.S. Forest Service.