US Bridges

Upper Reservoir RD over Irrigation Canal 069

Fair

Sanders County, Montana · 4M N Lonepine · Structure no. L45163000+06001

Built
1991
34 years old
Condition
Fair
inspected February 2025
Type
Tee Beam
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Upper Reservoir RD over Irrigation Canal 069 is a prestressed concrete tee beam carrying Upper Reservoir RD over Irrigation Canal 069 in Sanders County, Montana. It was built in 1991, so it is 34 years old, younger 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 46 ft (14 m) long and 19 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesUpper Reservoir RD
CrossesIrrigation Canal 069
Location4M N Lonepine
RouteCounty Highway 45328
StateMontana
Coordinates47.74062, -114.68073
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
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 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 rating40 US tons
Inventory rating30 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width19 ft (5.8 m)
Roadway width18 ft (5.5 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 closed16.2 mi (26 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 Upper Reservoir RD over Irrigation Canal 069 built?

It was built in 1991, making it 34 years old in 2025.

What condition is Upper Reservoir RD over Irrigation Canal 069 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 February 2025.

How much traffic does Upper Reservoir RD over Irrigation Canal 069 carry?

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

How long is Upper Reservoir RD over Irrigation Canal 069?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 19 ft wide.

Who owns Upper Reservoir RD over Irrigation Canal 069?

It is owned by the County Highway Agency.