US Bridges

County Road 451 over Usbr Main Canal 091

Fair

Richland County, Montana · 7M SW Savage · Structure no. L42451000+08001

Built
2001
24 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
17
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 451 over Usbr Main Canal 091 is a prestressed concrete tee beam carrying County Road 451 over Usbr Main Canal 091 in Richland County, Montana. It was built in 2001, so it is 24 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 17 vehicles a day, roughly 3% of them trucks, projected to reach 18 by 2043. The structure is 73 ft (22.3 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty Road 451
CrossesUsbr Main Canal 091
Location7M SW Savage
RouteCounty Highway 42451
CountyRichland County
StateMontana
Coordinates47.3684, -104.41286
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.9 US tons
Inventory rating28.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length73 ft (22.3 m)
Longest span70 ft (21.2 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17 (2023)
Projected traffic18 by 2043
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 statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 451 over Usbr Main Canal 091 built?

It was built in 2001, making it 24 years old in 2025.

What condition is County Road 451 over Usbr Main Canal 091 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 February 2023.

How much traffic does County Road 451 over Usbr Main Canal 091 carry?

About 17 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Road 451 over Usbr Main Canal 091?

The structure is 73 ft (22.3 m) long with a longest span of 70 ft (21.2 m) and a deck 26 ft wide.

Who owns County Road 451 over Usbr Main Canal 091?

It is owned by the County Highway Agency.