US Bridges

Jocko Canyon RD over Jocko River 011

Poor

Lake County, Montana · 4M E Arlee · Structure no. L24339000+06001

Built
1975
50 years old
Condition
Poor
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Jocko Canyon RD over Jocko River 011 is a prestressed concrete tee beam carrying Jocko Canyon RD over Jocko River 011 in Lake County, Montana. It was built in 1975, so it is 50 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 44 ft (13.4 m) long and 24 ft wide. If it were closed, the detour would be 28 mi (45 km).

CarriesJocko Canyon RD
CrossesJocko River 011
Location4M E Arlee
RouteCounty Highway 24400
StateMontana
Coordinates47.15575, -113.99275
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 Jocko Canyon RD over Jocko River 011 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Jocko Canyon RD over Jocko River 011 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Jocko Canyon RD over Jocko River 011 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Jocko Canyon RD over Jocko River 011?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 24 ft wide.

Who owns Jocko Canyon RD over Jocko River 011?

It is owned by the County Highway Agency.