US Bridges

S 16 over Ator Creek

Fair

Sheridan County, Montana · 3M NW Antelope · Structure no. P00022046+03361

Built
1984
41 years old
Condition
Fair
inspected September 2023
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
1,559
2023 count
Owner
State
State Highway Agency

About this bridge

S 16 over Ator Creek is a steel culvert carrying S 16 over Ator Creek in Sheridan County, Montana. It was built in 1984, so it is 41 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 1,559 vehicles a day, roughly 11% of them trucks, projected to reach 1,637 by 2043. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesS 16
CrossesAtor Creek
Location3M NW Antelope
RouteState Highway 16
CountySheridan County
StateMontana
Coordinates48.7363, -104.48059
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.5 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,559 (2023)
Projected traffic1,637 by 2043
Trucks11%
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 16 over Ator Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is S 16 over Ator 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 September 2023.

How much traffic does S 16 over Ator Creek carry?

About 1,559 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is S 16 over Ator Creek?

The structure is 25 ft (7.5 m) long with a longest span of 9 ft (2.7 m).

Who owns S 16 over Ator Creek?

It is owned by the State Highway Agency.