US Bridges

County Road 405 over Usbr Main Canal 005

Good

Richland County, Montana · 6M SW Sidney · Structure no. L42405002+00001

Built
2006
19 years old
Condition
Good
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

County Road 405 over Usbr Main Canal 005 is a prestressed concrete tee beam carrying County Road 405 over Usbr Main Canal 005 in Richland County, Montana. It was built in 2006, so it is 19 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 66 ft (20.1 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road 405
CrossesUsbr Main Canal 005
Location6M SW Sidney
RouteCounty Highway 42405
CountyRichland County
StateMontana
Coordinates47.64467, -104.24402
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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.9 US tons
Inventory rating18 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length66 ft (20.1 m)
Longest span66 ft (20.1 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.3 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 closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$64,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 405 over Usbr Main Canal 005 built?

It was built in 2006, making it 19 years old in 2025.

What condition is County Road 405 over Usbr Main Canal 005 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 February 2023.

How much traffic does County Road 405 over Usbr Main Canal 005 carry?

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

How long is County Road 405 over Usbr Main Canal 005?

The structure is 66 ft (20.1 m) long with a longest span of 66 ft (20.1 m) and a deck 36 ft wide.

Who owns County Road 405 over Usbr Main Canal 005?

It is owned by the County Highway Agency.