US Bridges

S 8th RD over Huntley Main Canal

Good

Yellowstone County, Montana · 4M NE Huntley · Structure no. 000000202004772

Built
2020
5 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
165
2023 count
Owner
County
County Highway Agency

About this bridge

S 8th RD over Huntley Main Canal is a prestressed concrete stringer/multi-beam or girder carrying S 8th RD over Huntley Main Canal in Yellowstone County, Montana. It was built in 2020, so it is 5 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 165 vehicles a day, roughly 3% of them trucks, projected to reach 174 by 2043. The structure is 41 ft (12.5 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesS 8th RD
CrossesHuntley Main Canal
Location4M NE Huntley
RouteCounty Highway 56231
CountyYellowstone County
StateMontana
Coordinates45.92686, -108.23783
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length41 ft (12.5 m)
Longest span41 ft (12.5 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic165 (2023)
Projected traffic174 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 8th RD over Huntley Main Canal built?

It was built in 2020, making it 5 years old in 2025.

What condition is S 8th RD over Huntley Main Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does S 8th RD over Huntley Main Canal carry?

About 165 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S 8th RD over Huntley Main Canal?

The structure is 41 ft (12.5 m) long with a longest span of 41 ft (12.5 m) and a deck 26 ft wide.

Who owns S 8th RD over Huntley Main Canal?

It is owned by the County Highway Agency.