US Bridges

Mchugh LN over Helena Valley Canal 086

Good

Lewis and Clark County, Montana · 2M N Helena · Structure no. M25058000+00401

Built
2000
25 years old
Condition
Good
inspected February 2025
Type
Tee Beam
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
1,893
2023 count
Owner
County
County Highway Agency

About this bridge

Mchugh LN over Helena Valley Canal 086 is a prestressed concrete tee beam carrying Mchugh LN over Helena Valley Canal 086 in Lewis and Clark County, Montana. It was built in 2000, so it is 25 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 1,893 vehicles a day, projected to reach 2,224 by 2043. The structure is 47 ft (14.4 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesMchugh LN
CrossesHelena Valley Canal 086
Location2M N Helena
RouteCity Street 25058
StateMontana
Coordinates46.63233, -112.03184
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length47 ft (14.4 m)
Longest span47 ft (14.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,893 (2023)
Projected traffic2,224 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Mchugh LN over Helena Valley Canal 086 built?

It was built in 2000, making it 25 years old in 2025.

What condition is Mchugh LN over Helena Valley Canal 086 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 February 2025.

How much traffic does Mchugh LN over Helena Valley Canal 086 carry?

About 1,893 vehicles per day (2023 count).

How long is Mchugh LN over Helena Valley Canal 086?

The structure is 47 ft (14.4 m) long with a longest span of 47 ft (14.4 m) and a deck 30 ft wide.

Who owns Mchugh LN over Helena Valley Canal 086?

It is owned by the County Highway Agency.