US Bridges

Green Meadow DR over Helena Valley Canal

Good

Lewis and Clark County, Montana · 2M N Helena · Structure no. S00231002+01001

Built
1992
33 years old
Condition
Good
inspected October 2024
Type
Slab
Concrete Continuous
Length
62 ft
3 main spans
Daily traffic
4,510
2023 count
Owner
State
State Highway Agency

About this bridge

Green Meadow DR over Helena Valley Canal is a concrete continuous slab carrying Green Meadow DR over Helena Valley Canal in Lewis and Clark County, Montana. It was built in 1992, so it is 33 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 4,510 vehicles a day, roughly 1% of them trucks, projected to reach 4,736 by 2043. The structure is 62 ft (18.9 m) long and 42 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesGreen Meadow DR
CrossesHelena Valley Canal
Location2M N Helena
RouteState Highway 5820
StateMontana
Coordinates46.64841, -112.04728
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
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 rating37.5 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span23 ft (7 m)
Deck width42 ft (12.9 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,510 (2023)
Projected traffic4,736 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Green Meadow DR over Helena Valley Canal built?

It was built in 1992, making it 33 years old in 2025.

What condition is Green Meadow DR over Helena Valley Canal 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 2024.

How much traffic does Green Meadow DR over Helena Valley Canal carry?

About 4,510 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Green Meadow DR over Helena Valley Canal?

The structure is 62 ft (18.9 m) long with a longest span of 23 ft (7 m) and a deck 42 ft wide.

Who owns Green Meadow DR over Helena Valley Canal?

It is owned by the State Highway Agency.