US Bridges

Sloway Frntge RD E over Abandoned RR 001

Poor

Mineral County, Montana · 5M E ST Regis · Structure no. L31203001+03001

Built
1956
69 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
482 ft
2 main spans
Daily traffic
100
2025 count
Owner
State
State Highway Agency

About this bridge

Sloway Frntge RD E over Abandoned RR 001 is a steel stringer/multi-beam or girder carrying Sloway Frntge RD E over Abandoned RR 001 in Mineral County, Montana. It was built in 1956, so it is 69 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 482 ft (146.9 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesSloway Frntge RD E
CrossesAbandoned RR 001
Location5M E ST Regis
RouteState Highway 31203
CountyMineral County
StateMontana
Coordinates47.2376, -115.04874
Functional classRural Local

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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating45 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+8 approach)
Design loadHL 93
Structure length482 ft (146.9 m)
Longest span73 ft (22.3 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 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
CrossesOther
Detour if closed9.9 mi (16 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 Sloway Frntge RD E over Abandoned RR 001 built?

It was built in 1956, making it 69 years old in 2025.

What condition is Sloway Frntge RD E over Abandoned RR 001 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 June 2023.

How much traffic does Sloway Frntge RD E over Abandoned RR 001 carry?

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

How long is Sloway Frntge RD E over Abandoned RR 001?

The structure is 482 ft (146.9 m) long with a longest span of 73 ft (22.3 m) and a deck 33 ft wide.

Who owns Sloway Frntge RD E over Abandoned RR 001?

It is owned by the State Highway Agency.