US Bridges

Mill Creek RD over Mill Creek 045

Good

Park County, Montana · 7M E Emigrant · Structure no. L34204006+00001

Built
1972
53 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
104
2023 count
Owner
County
County Highway Agency

About this bridge

Mill Creek RD over Mill Creek 045 is a prestressed concrete stringer/multi-beam or girder carrying Mill Creek RD over Mill Creek 045 in Park County, Montana. It was built in 1972, so it is 53 years old, older 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 104 vehicles a day, roughly 3% of them trucks, projected to reach 111 by 2043. The structure is 78 ft (23.8 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMill Creek RD
CrossesMill Creek 045
Location7M E Emigrant
RouteCounty Highway 34204
StateMontana
Coordinates45.35074, -110.60964
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating46 US tons
Inventory rating27 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span75 ft (22.9 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104 (2023)
Projected traffic111 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 Mill Creek RD over Mill Creek 045 built?

It was built in 1972, making it 53 years old in 2025.

What condition is Mill Creek RD over Mill Creek 045 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 May 2023.

How much traffic does Mill Creek RD over Mill Creek 045 carry?

About 104 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Mill Creek RD over Mill Creek 045?

The structure is 78 ft (23.8 m) long with a longest span of 75 ft (22.9 m) and a deck 34 ft wide.

Who owns Mill Creek RD over Mill Creek 045?

It is owned by the County Highway Agency.