US Bridges

Yard Office Road over Big Ditch 110

Fair

Yellowstone County, Montana · Laurel-Yard Office Road · Structure no. M56069000+00101

Built
1982
43 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Yard Office Road over Big Ditch 110 is a prestressed concrete tee beam carrying Yard Office Road over Big Ditch 110 in Yellowstone County, Montana. It was built in 1982, so it is 43 years old, younger 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 32 ft (9.8 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesYard Office Road
CrossesBig Ditch 110
LocationLaurel-Yard Office Road
RouteCity Street 56069
StateMontana
Coordinates45.68707, -108.74059
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 rating55 US tons
Inventory rating42 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 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 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 Yard Office Road over Big Ditch 110 built?

It was built in 1982, making it 43 years old in 2025.

What condition is Yard Office Road over Big Ditch 110 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 January 2025.

How much traffic does Yard Office Road over Big Ditch 110 carry?

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

How long is Yard Office Road over Big Ditch 110?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 28 ft wide.

Who owns Yard Office Road over Big Ditch 110?

It is owned by the County Highway Agency.