US Bridges

Upper Spring CR RD over Mill Ditch

Fair

Fergus County, Montana · Lewistown · Structure no. S00238000+00271

Built
1958
67 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
49 ft
2 main spans
Daily traffic
1,955
2023 count
Owner
State
State Highway Agency

About this bridge

Upper Spring CR RD over Mill Ditch is a concrete slab carrying Upper Spring CR RD over Mill Ditch in Fergus County, Montana. It was built in 1958, so it is 67 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.

It carries about 1,955 vehicles a day, roughly 1% of them trucks, projected to reach 2,053 by 2043. The structure is 49 ft (14.9 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesUpper Spring CR RD
CrossesMill Ditch
LocationLewistown
RouteState Highway 238
CountyFergus County
StateMontana
Coordinates47.0635, -109.4178
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length49 ft (14.9 m)
Longest span25 ft (7.6 m)
Deck width39 ft (11.9 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,955 (2023)
Projected traffic2,053 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Upper Spring CR RD over Mill Ditch built?

It was built in 1958, making it 67 years old in 2025.

What condition is Upper Spring CR RD over Mill Ditch 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 Upper Spring CR RD over Mill Ditch carry?

About 1,955 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Upper Spring CR RD over Mill Ditch?

The structure is 49 ft (14.9 m) long with a longest span of 25 ft (7.6 m) and a deck 39 ft wide.

Who owns Upper Spring CR RD over Mill Ditch?

It is owned by the State Highway Agency.