US Bridges

US 93 FH 19 over Bitterroot River

Fair

Ravalli County, Montana · 4M SE Darby · Structure no. P00007026+04491

Built
1986
39 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
244 ft
4 main spans
Daily traffic
1,099
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 FH 19 over Bitterroot River is a prestressed concrete stringer/multi-beam or girder carrying US 93 FH 19 over Bitterroot River in Ravalli County, Montana. It was built in 1986, so it is 39 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 1,099 vehicles a day, roughly 4% of them trucks, projected to reach 1,154 by 2043. The structure is 244 ft (74.5 m) long and 42 ft wide. If it were closed, the detour would be 78.3 mi (126 km).

CarriesUS 93 FH 19
CrossesBitterroot River
Location4M SE Darby
RouteU.S. Route 93
StateMontana
Coordinates45.97234, -114.14129
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length244 ft (74.5 m)
Longest span96 ft (29.4 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,099 (2023)
Projected traffic1,154 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed78.3 mi (126 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 93 FH 19 over Bitterroot River built?

It was built in 1986, making it 39 years old in 2025.

What condition is US 93 FH 19 over Bitterroot River 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 2024.

How much traffic does US 93 FH 19 over Bitterroot River carry?

About 1,099 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 93 FH 19 over Bitterroot River?

The structure is 244 ft (74.5 m) long with a longest span of 96 ft (29.4 m) and a deck 42 ft wide.

Who owns US 93 FH 19 over Bitterroot River?

It is owned by the State Highway Agency.