US Bridges

Miller Street over Mill Ditch 041

FairPosted for load

Fergus County, Montana · Lewistown-Miller ST · Structure no. M14071000+00101

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
35 ft
1 main span
Daily traffic
100
2025 count
Owner
City
City or Municipal Highway Agency

About this bridge

Miller Street over Mill Ditch 041 is a steel stringer/multi-beam or girder carrying Miller Street over Mill Ditch 041 in Fergus 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 35 ft (10.7 m) long and 25 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMiller Street
CrossesMill Ditch 041
LocationLewistown-Miller ST
RouteCity Street 14071
StateMontana
Coordinates47.06776, -109.42106
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26 US tons
Inventory rating20 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length35 ft (10.7 m)
Longest span34 ft (10.4 m)
Deck width25 ft (7.7 m)
Roadway width20 ft (6.1 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 closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Miller Street over Mill Ditch 041 built?

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

What condition is Miller Street over Mill Ditch 041 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 March 2023.

How much traffic does Miller Street over Mill Ditch 041 carry?

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

How long is Miller Street over Mill Ditch 041?

The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 25 ft wide.

Who owns Miller Street over Mill Ditch 041?

It is owned by the City or Municipal Highway Agency.