US Bridges

S 511 over Whitetail Creek

Fair

Daniels County, Montana · Whitetail · Structure no. S00511006+03001

Built
2004
21 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
132
2023 count
Owner
State
State Highway Agency

About this bridge

S 511 over Whitetail Creek is a prestressed concrete stringer/multi-beam or girder carrying S 511 over Whitetail Creek in Daniels County, Montana. It was built in 2004, so it is 21 years old, younger 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 6 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 132 vehicles a day, roughly 7% of them trucks, projected to reach 139 by 2043. The structure is 80 ft (24.4 m) long and 30 ft wide. If it were closed, the detour would be 62.8 mi (101 km).

Location

Open in Google Maps
CarriesS 511
CrossesWhitetail Creek
LocationWhitetail
RouteState Highway 511
CountyDaniels County
StateMontana
Coordinates48.89156, -105.16413
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length80 ft (24.4 m)
Longest span79 ft (24 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic132 (2023)
Projected traffic139 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed62.8 mi (101 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S 511 over Whitetail Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is S 511 over Whitetail 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 January 2024.

How much traffic does S 511 over Whitetail Creek carry?

About 132 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S 511 over Whitetail Creek?

The structure is 80 ft (24.4 m) long with a longest span of 79 ft (24 m) and a deck 30 ft wide.

Who owns S 511 over Whitetail Creek?

It is owned by the State Highway Agency.