US Bridges

Nissen LN over East Bench Canal 001

FairPosted for load

Beaverhead County, Montana · 3M E Dillon · Structure no. L01224002+01001

Built
1962
63 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
52 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Nissen LN over East Bench Canal 001 is a wood or timber stringer/multi-beam or girder carrying Nissen LN over East Bench Canal 001 in Beaverhead County, Montana. It was built in 1962, so it is 63 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 5 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 52 ft (15.8 m) long and 26 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesNissen LN
CrossesEast Bench Canal 001
Location3M E Dillon
RouteCounty Highway 1224
StateMontana
Coordinates45.23267, -112.56247
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating27.4 US tons
Inventory rating20 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length52 ft (15.8 m)
Longest span26 ft (7.9 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.7 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 closed8.1 mi (13 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 Nissen LN over East Bench Canal 001 built?

It was built in 1962, making it 63 years old in 2025.

What condition is Nissen LN over East Bench Canal 001 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 January 2025.

How much traffic does Nissen LN over East Bench Canal 001 carry?

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

How long is Nissen LN over East Bench Canal 001?

The structure is 52 ft (15.8 m) long with a longest span of 26 ft (7.9 m) and a deck 26 ft wide.

Who owns Nissen LN over East Bench Canal 001?

It is owned by the County Highway Agency.