US Bridges

Comertown RD over Drainage 053

Fair

Sheridan County, Montana · 10M W Westby · Structure no. L46102000+07001

Built
1989
36 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
19
2023 count
Owner
County
County Highway Agency

About this bridge

Comertown RD over Drainage 053 is a prestressed concrete tee beam carrying Comertown RD over Drainage 053 in Sheridan County, Montana. It was built in 1989, so it is 36 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 5 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 19 vehicles a day, roughly 3% of them trucks, projected to reach 20 by 2043. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesComertown RD
CrossesDrainage 053
Location10M W Westby
RouteCounty Highway 46102
CountySheridan County
StateMontana
Coordinates48.82011, -104.25347
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19 (2023)
Projected traffic20 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 Comertown RD over Drainage 053 built?

It was built in 1989, making it 36 years old in 2025.

What condition is Comertown RD over Drainage 053 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 2023.

How much traffic does Comertown RD over Drainage 053 carry?

About 19 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Comertown RD over Drainage 053?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns Comertown RD over Drainage 053?

It is owned by the County Highway Agency.