US Bridges

BIA RTE 1 over Blacktail Creek

Good

Pondera County, Montana · 4.0KM SE of Heart Butte · Structure no. 0000C51201B0104

Built
2021
4 years old
Condition
Good
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
700
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

BIA RTE 1 over Blacktail Creek is a prestressed concrete tee beam carrying BIA RTE 1 over Blacktail Creek in Pondera County, Montana. It was built in 2021, so it is 4 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 700 vehicles a day, roughly 10% of them trucks, projected to reach 712 by 2043. The structure is 60 ft (18.3 m) long and 34 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

CarriesBIA RTE 1
CrossesBlacktail Creek
Location4.0KM SE of Heart Butte
RouteFederal Lands Road 1
StateMontana
Coordinates48.24871, -112.78959
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating89.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span60 ft (18.3 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2023)
Projected traffic712 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
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 BIA RTE 1 over Blacktail Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is BIA RTE 1 over Blacktail Creek 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 September 2023.

How much traffic does BIA RTE 1 over Blacktail Creek carry?

About 700 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is BIA RTE 1 over Blacktail Creek?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.

Who owns BIA RTE 1 over Blacktail Creek?

It is owned by the Bureau of Indian Affairs.