US Bridges

S 540-E River RD over Mill Creek

Fair

Park County, Montana · 2M NE Pray · Structure no. S00540017+03701

Built
1925
100 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
67 ft
2 main spans
Daily traffic
909
2023 count
Owner
State
State Highway Agency

About this bridge

S 540-E River RD over Mill Creek is a steel stringer/multi-beam or girder carrying S 540-E River RD over Mill Creek in Park County, Montana. It was built in 1925, so it is 100 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 909 vehicles a day, projected to reach 954 by 2043. The structure is 67 ft (20.4 m) long and 21 ft wide. If it were closed, the detour would be 64 mi (103 km).

Location

Open in Google Maps
CarriesS 540-E River RD
CrossesMill Creek
Location2M NE Pray
RouteState Highway 540
CountyPark County
StateMontana
Coordinates45.41291, -110.64913
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length67 ft (20.4 m)
Longest span33 ft (10.1 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic909 (2023)
Projected traffic954 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed64 mi (103 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$126,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S 540-E River RD over Mill Creek built?

It was built in 1925, making it 100 years old in 2025.

What condition is S 540-E River RD over Mill Creek 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 July 2024.

How much traffic does S 540-E River RD over Mill Creek carry?

About 909 vehicles per day (2023 count).

How long is S 540-E River RD over Mill Creek?

The structure is 67 ft (20.4 m) long with a longest span of 33 ft (10.1 m) and a deck 21 ft wide.

Who owns S 540-E River RD over Mill Creek?

It is owned by the State Highway Agency.