US Bridges

Willow Glen RD over Mill Creek 004

Good

Deer Lodge County, Montana · 1M W Opportunity · Structure no. L12024002+03001

Built
2015
10 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
52 ft
1 main span
Daily traffic
257
2023 count
Owner
County
County Highway Agency

About this bridge

Willow Glen RD over Mill Creek 004 is a steel stringer/multi-beam or girder carrying Willow Glen RD over Mill Creek 004 in Deer Lodge County, Montana. It was built in 2015, so it is 10 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 257 vehicles a day, roughly 3% of them trucks, projected to reach 275 by 2043. The structure is 52 ft (15.7 m) long and 26 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesWillow Glen RD
CrossesMill Creek 004
Location1M W Opportunity
RouteCounty Highway 12024
StateMontana
Coordinates46.10179, -112.87828
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 protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating41 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length52 ft (15.7 m)
Longest span50 ft (15.2 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic257 (2023)
Projected traffic275 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Willow Glen RD over Mill Creek 004 built?

It was built in 2015, making it 10 years old in 2025.

What condition is Willow Glen RD over Mill Creek 004 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 December 2023.

How much traffic does Willow Glen RD over Mill Creek 004 carry?

About 257 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Willow Glen RD over Mill Creek 004?

The structure is 52 ft (15.7 m) long with a longest span of 50 ft (15.2 m) and a deck 26 ft wide.

Who owns Willow Glen RD over Mill Creek 004?

It is owned by the County Highway Agency.