US Bridges

Cliff RD over West Bench Canal 028

Good

Beaverhead County, Montana · 1M W Dillon · Structure no. 000000000002144

Built
2018
7 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
55 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Cliff RD over West Bench Canal 028 is a steel stringer/multi-beam or girder carrying Cliff RD over West Bench Canal 028 in Beaverhead County, Montana. It was built in 2018, so it is 7 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 55 ft (16.8 m) long and 17 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesCliff RD
CrossesWest Bench Canal 028
Location1M W Dillon
RouteCounty Highway 1028
StateMontana
Coordinates45.21827, -112.65692
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating40 US tons
Inventory rating31 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length55 ft (16.8 m)
Longest span53 ft (16.2 m)
Deck width17 ft (5.2 m)
Roadway width16 ft (4.9 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 closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cliff RD over West Bench Canal 028 built?

It was built in 2018, making it 7 years old in 2025.

What condition is Cliff RD over West Bench Canal 028 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.

How much traffic does Cliff RD over West Bench Canal 028 carry?

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

How long is Cliff RD over West Bench Canal 028?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.2 m) and a deck 17 ft wide.

Who owns Cliff RD over West Bench Canal 028?

It is owned by the County Highway Agency.