US Bridges

County Road 329 over Usbr Main Canal 057

Fair

Richland County, Montana · 3M N Savage · Structure no. L42329000+03001

Built
1996
29 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
64
2023 count
Owner
County
County Highway Agency

About this bridge

County Road 329 over Usbr Main Canal 057 is a prestressed concrete tee beam carrying County Road 329 over Usbr Main Canal 057 in Richland County, Montana. It was built in 1996, so it is 29 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 64 vehicles a day, roughly 3% of them trucks, projected to reach 68 by 2043. The structure is 81 ft (24.7 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Road 329
CrossesUsbr Main Canal 057
Location3M N Savage
RouteCounty Highway 42329
CountyRichland County
StateMontana
Coordinates47.5003, -104.32689
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span78 ft (23.8 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64 (2023)
Projected traffic68 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 County Road 329 over Usbr Main Canal 057 built?

It was built in 1996, making it 29 years old in 2025.

What condition is County Road 329 over Usbr Main Canal 057 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 329 over Usbr Main Canal 057 carry?

About 64 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Road 329 over Usbr Main Canal 057?

The structure is 81 ft (24.7 m) long with a longest span of 78 ft (23.8 m) and a deck 32 ft wide.

Who owns County Road 329 over Usbr Main Canal 057?

It is owned by the County Highway Agency.