US Bridges

Trapper Creek RD over Big Hole River 008

Fair

Silver Bow County, Montana · W Melrose · Structure no. L47026000+02001

Built
2001
24 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
220 ft
2 main spans
Daily traffic
191
2023 count
Owner
County
County Highway Agency

About this bridge

Trapper Creek RD over Big Hole River 008 is a prestressed concrete stringer/multi-beam or girder carrying Trapper Creek RD over Big Hole River 008 in Silver Bow County, Montana. It was built in 2001, so it is 24 years old, younger 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 220 ft (67 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesTrapper Creek RD
CrossesBig Hole River 008
LocationW Melrose
RouteCounty Highway 47026
StateMontana
Coordinates45.62676, -112.68715
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating73 US tons
Inventory rating32 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length220 ft (67 m)
Longest span109 ft (33.3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.2 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 closed123.7 mi (199 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 Creek RD over Big Hole River 008 built?

It was built in 2001, making it 24 years old in 2025.

What condition is Trapper Creek RD over Big Hole River 008 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 July 2023.

How much traffic does Trapper Creek RD over Big Hole River 008 carry?

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

How long is Trapper Creek RD over Big Hole River 008?

The structure is 220 ft (67 m) long with a longest span of 109 ft (33.3 m) and a deck 26 ft wide.

Who owns Trapper Creek RD over Big Hole River 008?

It is owned by the County Highway Agency.