US Bridges

IRR - S 212 over Jocko River

Good

Sanders County, Montana · 1M E Dixon · Structure no. S00212000+01301

Built
1949
76 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
82 ft
1 main span
Daily traffic
934
2023 count
Owner
State
State Highway Agency

About this bridge

IRR - S 212 over Jocko River is a steel stringer/multi-beam or girder carrying IRR - S 212 over Jocko River in Sanders County, Montana. It was built in 1949, so it is 76 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 934 vehicles a day, roughly 3% of them trucks, projected to reach 981 by 2043. The structure is 82 ft (25.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIRR - S 212
CrossesJocko River
Location1M E Dixon
RouteState Highway 212
StateMontana
Coordinates47.31201, -114.29661
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating34 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length82 ft (25.1 m)
Longest span79 ft (24.1 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic934 (2023)
Projected traffic981 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 IRR - S 212 over Jocko River built?

It was built in 1949, making it 76 years old in 2025.

What condition is IRR - S 212 over Jocko River 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 March 2023.

How much traffic does IRR - S 212 over Jocko River carry?

About 934 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is IRR - S 212 over Jocko River?

The structure is 82 ft (25.1 m) long with a longest span of 79 ft (24.1 m) and a deck 28 ft wide.

Who owns IRR - S 212 over Jocko River?

It is owned by the State Highway Agency.