US Bridges

IRR - S 382 over RR

Poor

Sanders County, Montana · 1M E Perma · Structure no. S00382000+00001

Built
1965
60 years old
Condition
Poor
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
3 main spans
Daily traffic
391
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 382 over RR is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 382 over RR in Sanders County, Montana. It was built in 1965, so it is 60 years old, older 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 391 vehicles a day, roughly 11% of them trucks, projected to reach 411 by 2043. The structure is 130 ft (39.7 m) long and 32 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

Open in Google Maps
CarriesIRR - S 382
CrossesRR
Location1M E Perma
RouteState Highway 382
CountySanders County
StateMontana
Coordinates47.36557, -114.57641
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length130 ft (39.7 m)
Longest span45 ft (13.7 m)
Deck width32 ft (9.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic391 (2023)
Projected traffic411 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed39.8 mi (64 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR - S 382 over RR built?

It was built in 1965, making it 60 years old in 2025.

What condition is IRR - S 382 over RR 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 November 2023.

How much traffic does IRR - S 382 over RR carry?

About 391 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is IRR - S 382 over RR?

The structure is 130 ft (39.7 m) long with a longest span of 45 ft (13.7 m) and a deck 32 ft wide.

Who owns IRR - S 382 over RR?

It is owned by the State Highway Agency.