US Bridges

S 13 over Duck Creek

Fair

McCone County, Montana · 14M NE Circle · Structure no. P00025014+09561

Built
1992
33 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
97 ft
1 main span
Daily traffic
792
2023 count
Owner
State
State Highway Agency

About this bridge

S 13 over Duck Creek is a prestressed concrete stringer/multi-beam or girder carrying S 13 over Duck Creek in McCone County, Montana. It was built in 1992, so it is 33 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 792 vehicles a day, roughly 20% of them trucks, projected to reach 832 by 2043. The structure is 97 ft (29.7 m) long and 38 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesS 13
CrossesDuck Creek
Location14M NE Circle
RouteState Highway 13
CountyMcCone County
StateMontana
Coordinates47.6176, -105.49594
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating61.9 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length97 ft (29.7 m)
Longest span96 ft (29.3 m)
Deck width38 ft (11.7 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic792 (2023)
Projected traffic832 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 13 over Duck Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is S 13 over Duck 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 2025.

How much traffic does S 13 over Duck Creek carry?

About 792 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is S 13 over Duck Creek?

The structure is 97 ft (29.7 m) long with a longest span of 96 ft (29.3 m) and a deck 38 ft wide.

Who owns S 13 over Duck Creek?

It is owned by the State Highway Agency.