US Bridges

S 200 over Redwater River

Fair

McCone County, Montana · 1M NE Circle · Structure no. P00057280+00341

Built
1933
92 years old, rebuilt 1968
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
269 ft
4 main spans
Daily traffic
1,263
2023 count
Owner
State
State Highway Agency

About this bridge

S 200 over Redwater River is a steel continuous stringer/multi-beam or girder carrying S 200 over Redwater River in McCone County, Montana. It was built in 1933 and reconstructed in 1968, so it is 92 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 1,263 vehicles a day, roughly 14% of them trucks, projected to reach 1,339 by 2043. The structure is 269 ft (82.1 m) long and 35 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesS 200
CrossesRedwater River
Location1M NE Circle
RouteState Highway 200
CountyMcCone County
StateMontana
Coordinates47.42464, -105.57089
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length269 ft (82.1 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,263 (2023)
Projected traffic1,339 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 S 200 over Redwater River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1968.

What condition is S 200 over Redwater 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 June 2023.

How much traffic does S 200 over Redwater River carry?

About 1,263 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is S 200 over Redwater River?

The structure is 269 ft (82.1 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns S 200 over Redwater River?

It is owned by the State Highway Agency.