US Bridges

Fourth ST over Cottonwood Creek 080

Good

Powell County, Montana · Deer LODGE-4th ST · Structure no. M39031000+00901

Built
2007
18 years old
Condition
Good
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Fourth ST over Cottonwood Creek 080 is a prestressed concrete tee beam carrying Fourth ST over Cottonwood Creek 080 in Powell County, Montana. It was built in 2007, so it is 18 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 36 ft (11 m) long and 39 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesFourth ST
CrossesCottonwood Creek 080
LocationDeer LODGE-4th ST
RouteCity Street 31
StateMontana
Coordinates46.4007, -112.7335
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.9 US tons
Inventory rating49.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width39 ft (11.9 m)
Roadway width26 ft (7.9 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 closed0.6 mi (1 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 Fourth ST over Cottonwood Creek 080 built?

It was built in 2007, making it 18 years old in 2025.

What condition is Fourth ST over Cottonwood Creek 080 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does Fourth ST over Cottonwood Creek 080 carry?

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

How long is Fourth ST over Cottonwood Creek 080?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 39 ft wide.

Who owns Fourth ST over Cottonwood Creek 080?

It is owned by the County Highway Agency.