US Bridges

Castle Mountain RD over Brackett Creek 032

FairPosted for load

Park County, Montana · 2M S Clyde Park · Structure no. L34030001+06001

Built
1970
55 years old, rebuilt 2010
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Castle Mountain RD over Brackett Creek 032 is a steel stringer/multi-beam or girder carrying Castle Mountain RD over Brackett Creek 032 in Park County, Montana. It was built in 1970 and reconstructed in 2010, so it is 55 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 27 ft (8.1 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesCastle Mountain RD
CrossesBrackett Creek 032
Location2M S Clyde Park
RouteCounty Highway 34030
CountyPark County
StateMontana
Coordinates45.86047, -110.61545
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 protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.4 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length27 ft (8.1 m)
Longest span24 ft (7.3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$119,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Castle Mountain RD over Brackett Creek 032 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2010.

What condition is Castle Mountain RD over Brackett Creek 032 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 August 2023.

How much traffic does Castle Mountain RD over Brackett Creek 032 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Castle Mountain RD over Brackett Creek 032?

The structure is 27 ft (8.1 m) long with a longest span of 24 ft (7.3 m) and a deck 20 ft wide.

Who owns Castle Mountain RD over Brackett Creek 032?

It is owned by the County Highway Agency.