US Bridges

Neibauer RD over Big Ditch 038

Fair

Yellowstone County, Montana · 4M NE Laurel · Structure no. L56505004+01001

Built
1960
65 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
138
2023 count
Owner
County
County Highway Agency

About this bridge

Neibauer RD over Big Ditch 038 is a steel stringer/multi-beam or girder carrying Neibauer RD over Big Ditch 038 in Yellowstone County, Montana. It was built in 1960, so it is 65 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 138 vehicles a day, roughly 3% of them trucks, projected to reach 146 by 2043. The structure is 28 ft (8.5 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNeibauer RD
CrossesBig Ditch 038
Location4M NE Laurel
RouteCounty Highway 56505
StateMontana
Coordinates45.72628, -108.71349
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating37 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.1 m)
Deck width29 ft (8.8 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic138 (2023)
Projected traffic146 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Neibauer RD over Big Ditch 038 built?

It was built in 1960, making it 65 years old in 2025.

What condition is Neibauer RD over Big Ditch 038 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 December 2024.

How much traffic does Neibauer RD over Big Ditch 038 carry?

About 138 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Neibauer RD over Big Ditch 038?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.1 m) and a deck 29 ft wide.

Who owns Neibauer RD over Big Ditch 038?

It is owned by the County Highway Agency.