US Bridges

Soft Rock RD over Bitterroot Canal 059

Fair

Ravalli County, Montana · 3M E Corvallis · Structure no. L41423000+06001

Built
1977
48 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
39 ft
2 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Soft Rock RD over Bitterroot Canal 059 is a steel stringer/multi-beam or girder carrying Soft Rock RD over Bitterroot Canal 059 in Ravalli County, Montana. It was built in 1977, so it is 48 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 39 ft (11.9 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSoft Rock RD
CrossesBitterroot Canal 059
Location3M E Corvallis
RouteCounty Highway 41423
CountyRavalli County
StateMontana
Coordinates46.3235, -114.04967
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span18 ft (5.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 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 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 Soft Rock RD over Bitterroot Canal 059 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Soft Rock RD over Bitterroot Canal 059 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 November 2024.

How much traffic does Soft Rock RD over Bitterroot Canal 059 carry?

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

How long is Soft Rock RD over Bitterroot Canal 059?

The structure is 39 ft (11.9 m) long with a longest span of 18 ft (5.5 m) and a deck 30 ft wide.

Who owns Soft Rock RD over Bitterroot Canal 059?

It is owned by the County Highway Agency.