US Bridges

Storm Castle Road over Gallatin River

FairPosted for load

Gallatin County, Montana · Storm Castle Creek · Structure no. 011106000000011

Built
1935
90 years old, rebuilt 1989
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete
Length
148 ft
1 main span
Daily traffic
99
Owner
Federal
U.S. Forest Service

About this bridge

Storm Castle Road over Gallatin River is a concrete arch - deck carrying Storm Castle Road over Gallatin River in Gallatin County, Montana. It was built in 1935 and reconstructed in 1989, so it is 90 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. Its operating status is: posted for load restriction.

It carries about 99 vehicles a day, projected to reach 148 by 2045. The structure is 148 ft (45.1 m) long and 22 ft wide.

Location

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CarriesStorm Castle Road
CrossesGallatin River
LocationStorm Castle Creek
RouteFederal Lands Road 132
CountyGallatin County
StateMontana
Coordinates45.45829, -111.24671
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating15.3 US tons
Inventory rating11.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 15
Structure length148 ft (45.1 m)
Longest span96 ft (29.3 m)
Deck width22 ft (6.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99 (—)
Projected traffic148 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 Gallatin River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1989.

What condition is Storm Castle Road over Gallatin River 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 Gallatin River carry?

About 99 vehicles per day (latest count).

How long is Storm Castle Road over Gallatin River?

The structure is 148 ft (45.1 m) long with a longest span of 96 ft (29.3 m) and a deck 22 ft wide.

Who owns Storm Castle Road over Gallatin River?

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