US Bridges

Dalton Mtn Road over Blackfot River 095

Good

Lewis and Clark County, Montana · 3M W Lincoln · Structure no. 000000202503423

Built
2024
1 years old
Condition
Good
inspected November 2024
Type
Truss - Thru
Steel
Length
150 ft
1 main span
Daily traffic
112
2023 count
Owner
County
County Highway Agency

About this bridge

Dalton Mtn Road over Blackfot River 095 is a steel truss - thru carrying Dalton Mtn Road over Blackfot River 095 in Lewis and Clark County, Montana. It was built in 2024, so it is 1 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 112 vehicles a day, roughly 3% of them trucks, projected to reach 118 by 2043. The structure is 150 ft (45.7 m) long and 31 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesDalton Mtn Road
CrossesBlackfot River 095
Location3M W Lincoln
RouteCounty Highway 25502
CountyLewis and Clark County
StateMontana
Coordinates46.94352, -112.73954
Functional classRural Local

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.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment8: Equal to present desirable criteria
Operating rating40.7 US tons
Inventory rating31.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length150 ft (45.7 m)
Longest span150 ft (45.7 m)
Deck width31 ft (9.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic112 (2023)
Projected traffic118 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Dalton Mtn Road over Blackfot River 095 built?

It was built in 2024, making it 1 years old in 2025.

What condition is Dalton Mtn Road over Blackfot River 095 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 November 2024.

How much traffic does Dalton Mtn Road over Blackfot River 095 carry?

About 112 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Dalton Mtn Road over Blackfot River 095?

The structure is 150 ft (45.7 m) long with a longest span of 150 ft (45.7 m) and a deck 31 ft wide.

Who owns Dalton Mtn Road over Blackfot River 095?

It is owned by the County Highway Agency.