US Bridges

N Fork RD over Milk River 036

Good

Blaine County, Montana · 4M W Zurich · Structure no. 000000000002334

Built
2018
7 years old
Condition
Good
inspected October 2023
Type
Truss - Thru
Steel
Length
233 ft
2 main spans
Daily traffic
28
2023 count
Owner
County
County Highway Agency

About this bridge

N Fork RD over Milk River 036 is a steel truss - thru carrying N Fork RD over Milk River 036 in Blaine County, Montana. It was built in 2018, so it is 7 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 28 vehicles a day, roughly 3% of them trucks, projected to reach 30 by 2043. The structure is 233 ft (71.1 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesN Fork RD
CrossesMilk River 036
Location4M W Zurich
RouteCounty Highway 3308
StateMontana
Coordinates48.57806, -109.11021
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating27 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length233 ft (71.1 m)
Longest span147 ft (44.8 m)
Deck width30 ft (9.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28 (2023)
Projected traffic30 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 N Fork RD over Milk River 036 built?

It was built in 2018, making it 7 years old in 2025.

What condition is N Fork RD over Milk River 036 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 October 2023.

How much traffic does N Fork RD over Milk River 036 carry?

About 28 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is N Fork RD over Milk River 036?

The structure is 233 ft (71.1 m) long with a longest span of 147 ft (44.8 m) and a deck 30 ft wide.

Who owns N Fork RD over Milk River 036?

It is owned by the County Highway Agency.