US Bridges

Trapper CR RD over Big Hole Overflow 055

Fair

Beaverhead County, Montana · Melrose · Structure no. L01040000+04001

Built
1973
52 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
100 ft
2 main spans
Daily traffic
191
2023 count
Owner
County
County Highway Agency

About this bridge

Trapper CR RD over Big Hole Overflow 055 is a steel stringer/multi-beam or girder carrying Trapper CR RD over Big Hole Overflow 055 in Beaverhead County, Montana. It was built in 1973, so it is 52 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 191 vehicles a day, roughly 3% of them trucks, projected to reach 206 by 2043. The structure is 100 ft (30.5 m) long and 18 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesTrapper CR RD
CrossesBig Hole Overflow 055
LocationMelrose
RouteCounty Highway 1040
CountyBeaverhead County
StateMontana
Coordinates45.62215, -112.69042
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.
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span48 ft (14.7 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic191 (2023)
Projected traffic206 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Trapper CR RD over Big Hole Overflow 055 built?

It was built in 1973, making it 52 years old in 2025.

What condition is Trapper CR RD over Big Hole Overflow 055 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 2024.

How much traffic does Trapper CR RD over Big Hole Overflow 055 carry?

About 191 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Trapper CR RD over Big Hole Overflow 055?

The structure is 100 ft (30.5 m) long with a longest span of 48 ft (14.7 m) and a deck 18 ft wide.

Who owns Trapper CR RD over Big Hole Overflow 055?

It is owned by the County Highway Agency.