US Bridges

Sweetwater RD over East Bench Canal 060

FairPosted for load

Beaverhead County, Montana · 3M E Dillon · Structure no. L01206003+02001

Built
1962
63 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
60 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Sweetwater RD over East Bench Canal 060 is a wood or timber stringer/multi-beam or girder carrying Sweetwater RD over East Bench Canal 060 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 60 ft (18.3 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSweetwater RD
CrossesEast Bench Canal 060
Location3M E Dillon
RouteCounty Highway 1206
CountyBeaverhead County
StateMontana
Coordinates45.21653, -112.558
Functional classRural Minor Collector

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 inspectionDecember 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 20
Structure length60 ft (18.3 m)
Longest span29 ft (8.7 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.9 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 closed9.9 mi (16 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 Sweetwater RD over East Bench Canal 060 built?

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

What condition is Sweetwater RD over East Bench Canal 060 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 December 2023.

How much traffic does Sweetwater RD over East Bench Canal 060 carry?

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

How long is Sweetwater RD over East Bench Canal 060?

The structure is 60 ft (18.3 m) long with a longest span of 29 ft (8.7 m) and a deck 31 ft wide.

Who owns Sweetwater RD over East Bench Canal 060?

It is owned by the County Highway Agency.