US Bridges

Blakeslee RD over Canal 030

Fair

Petroleum County, Montana · 7M N Teigen · Structure no. L35111006+07001

Built
1978
47 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Blakeslee RD over Canal 030 is a prestressed concrete slab carrying Blakeslee RD over Canal 030 in Petroleum County, Montana. It was built in 1978, so it is 47 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 6 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 43 ft (13.1 m) long and 25 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

CarriesBlakeslee RD
CrossesCanal 030
Location7M N Teigen
RouteCounty Highway 35111
StateMontana
Coordinates47.12338, -108.58836
Functional classRural Minor Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 alignment7: Better than present minimum criteria
Operating rating57 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span39 ft (11.9 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.2 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 closed29.8 mi (48 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 Blakeslee RD over Canal 030 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Blakeslee RD over Canal 030 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 August 2024.

How much traffic does Blakeslee RD over Canal 030 carry?

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

How long is Blakeslee RD over Canal 030?

The structure is 43 ft (13.1 m) long with a longest span of 39 ft (11.9 m) and a deck 25 ft wide.

Who owns Blakeslee RD over Canal 030?

It is owned by the County Highway Agency.