US Bridges

S 200S over Upper 7 Mile Creek

Good

Dawson County, Montana · 9M SE Lindsay · Structure no. P00057313+09811

Built
1966
59 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
103 ft
2 main spans
Daily traffic
924
2023 count
Owner
State
State Highway Agency

About this bridge

S 200S over Upper 7 Mile Creek is a prestressed concrete stringer/multi-beam or girder carrying S 200S over Upper 7 Mile Creek in Dawson County, Montana. It was built in 1966, so it is 59 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 924 vehicles a day, roughly 19% of them trucks, projected to reach 979 by 2043. The structure is 103 ft (31.4 m) long and 42 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesS 200S
CrossesUpper 7 Mile Creek
Location9M SE Lindsay
RouteState Highway 200
StateMontana
Coordinates47.16061, -104.97636
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span51 ft (15.5 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic924 (2023)
Projected traffic979 by 2043
Trucks19%
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 200S over Upper 7 Mile Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is S 200S over Upper 7 Mile Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does S 200S over Upper 7 Mile Creek carry?

About 924 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is S 200S over Upper 7 Mile Creek?

The structure is 103 ft (31.4 m) long with a longest span of 51 ft (15.5 m) and a deck 42 ft wide.

Who owns S 200S over Upper 7 Mile Creek?

It is owned by the State Highway Agency.