US Bridges

Lil Bitterroot RD over Little Bitterroot Rv 070

Poor

Sanders County, Montana · 8M E Hot Springs · Structure no. L45215006+06001

Built
1978
47 years old
Condition
Poor
inspected February 2025
Type
Channel Beam
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Lil Bitterroot RD over Little Bitterroot Rv 070 is a prestressed concrete channel beam carrying Lil Bitterroot RD over Little Bitterroot Rv 070 in Sanders County, Montana. It was built in 1978, so it is 47 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 38 ft (11.6 m) long and 20 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesLil Bitterroot RD
CrossesLittle Bitterroot Rv 070
Location8M E Hot Springs
RouteCounty Highway 45305
CountySanders County
StateMontana
Coordinates47.59089, -114.52362
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no 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 alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating36 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span37 ft (11.3 m)
Deck width20 ft (6.2 m)
Roadway width19 ft (5.9 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 closed21.1 mi (34 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 Lil Bitterroot RD over Little Bitterroot Rv 070 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Lil Bitterroot RD over Little Bitterroot Rv 070 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2025.

How much traffic does Lil Bitterroot RD over Little Bitterroot Rv 070 carry?

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

How long is Lil Bitterroot RD over Little Bitterroot Rv 070?

The structure is 38 ft (11.6 m) long with a longest span of 37 ft (11.3 m) and a deck 20 ft wide.

Who owns Lil Bitterroot RD over Little Bitterroot Rv 070?

It is owned by the County Highway Agency.