US Bridges

S 522 (36-30) over Huntley Canal

Fair

Yellowstone County, Montana · 1M S Huntley · Structure no. S00522000+03681

Built
1967
58 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
4,332
2023 count
Owner
State
State Highway Agency

About this bridge

S 522 (36-30) over Huntley Canal is a prestressed concrete stringer/multi-beam or girder carrying S 522 (36-30) over Huntley Canal in Yellowstone County, Montana. It was built in 1967, so it is 58 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 5 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 4,332 vehicles a day, roughly 2% of them trucks, projected to reach 4,549 by 2043. The structure is 72 ft (21.9 m) long and 43 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesS 522 (36-30)
CrossesHuntley Canal
Location1M S Huntley
RouteState Highway 266
CountyYellowstone County
StateMontana
Coordinates45.88893, -108.31217
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,332 (2023)
Projected traffic4,549 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 522 (36-30) over Huntley Canal built?

It was built in 1967, making it 58 years old in 2025.

What condition is S 522 (36-30) over Huntley 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 November 2024.

How much traffic does S 522 (36-30) over Huntley Canal carry?

About 4,332 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is S 522 (36-30) over Huntley Canal?

The structure is 72 ft (21.9 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns S 522 (36-30) over Huntley Canal?

It is owned by the State Highway Agency.