US Bridges

Storm Castle Road over Sq___ Creek

Fair

Gallatin County, Montana · Castle Rock Cmp-Strm Cstl · Structure no. 011106000000012

Built
1954
71 years old, rebuilt 2014
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
29 ft
1 main span
Daily traffic
5
1993 count
Owner
Federal
U.S. Forest Service

About this bridge

Storm Castle Road over Sq___ Creek is a wood or timber stringer/multi-beam or girder carrying Storm Castle Road over Sq___ Creek in Gallatin County, Montana. It was built in 1954 and reconstructed in 2014, so it is 71 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 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 5 vehicles a day, projected to reach 7 by 2045. The structure is 29 ft (8.7 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

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CarriesStorm Castle Road
CrossesSq___ Creek
LocationCastle Rock Cmp-Strm Cstl
RouteFederal Lands Road 132
CountyGallatin County
StateMontana
Coordinates45.44109, -111.22846
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.4 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 15
Structure length29 ft (8.7 m)
Longest span27 ft (8.2 m)
Deck width15 ft (4.7 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (1993)
Projected traffic7 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 Storm Castle Road over Sq___ Creek built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2014.

What condition is Storm Castle Road over Sq___ 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 Storm Castle Road over Sq___ Creek carry?

About 5 vehicles per day (1993 count).

How long is Storm Castle Road over Sq___ Creek?

The structure is 29 ft (8.7 m) long with a longest span of 27 ft (8.2 m) and a deck 15 ft wide.

Who owns Storm Castle Road over Sq___ Creek?

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