US Bridges

S 16 over Usbr Main Canal

Fair

Richland County, Montana · 1M N Savage · Structure no. P00020032+06521

Built
1974
51 years old
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
2,313
2023 count
Owner
State
State Highway Agency

About this bridge

S 16 over Usbr Main Canal is a prestressed concrete stringer/multi-beam or girder carrying S 16 over Usbr Main Canal in Richland County, Montana. It was built in 1974, so it is 51 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 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 2,313 vehicles a day, roughly 13% of them trucks, projected to reach 2,440 by 2043. The structure is 77 ft (23.4 m) long and 54 ft wide. If it were closed, the detour would be 65.9 mi (106 km).

Location

Open in Google Maps
CarriesS 16
CrossesUsbr Main Canal
Location1M N Savage
RouteState Highway 16
CountyRichland County
StateMontana
Coordinates47.46503, -104.34281
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length77 ft (23.4 m)
Longest span75 ft (22.9 m)
Deck width54 ft (16.5 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,313 (2023)
Projected traffic2,440 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed65.9 mi (106 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 Usbr Main Canal built?

It was built in 1974, making it 51 years old in 2025.

What condition is S 16 over Usbr Main Canal 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 December 2022.

How much traffic does S 16 over Usbr Main Canal carry?

About 2,313 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is S 16 over Usbr Main Canal?

The structure is 77 ft (23.4 m) long with a longest span of 75 ft (22.9 m) and a deck 54 ft wide.

Who owns S 16 over Usbr Main Canal?

It is owned by the State Highway Agency.