US Bridges

County Road 434 over Usbr Main Canal 092

FairPosted for load

Richland County, Montana · 1M N Crane · Structure no. L42434000+04001

Built
1908
117 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
56 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

County Road 434 over Usbr Main Canal 092 is a steel truss - thru carrying County Road 434 over Usbr Main Canal 092 in Richland County, Montana. It was built in 1908, so it is 117 years old, older 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 56 ft (17.1 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty Road 434
CrossesUsbr Main Canal 092
Location1M N Crane
RouteCounty Highway 42434
CountyRichland County
StateMontana
Coordinates47.58666, -104.26179
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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating24 US tons
Inventory rating14 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length56 ft (17.1 m)
Longest span54 ft (16.5 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 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 statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$90,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 434 over Usbr Main Canal 092 built?

It was built in 1908, making it 117 years old in 2025.

What condition is County Road 434 over Usbr Main Canal 092 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 July 2023.

How much traffic does County Road 434 over Usbr Main Canal 092 carry?

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

How long is County Road 434 over Usbr Main Canal 092?

The structure is 56 ft (17.1 m) long with a longest span of 54 ft (16.5 m) and a deck 18 ft wide.

Who owns County Road 434 over Usbr Main Canal 092?

It is owned by the County Highway Agency.