US Bridges

Canyon Ferry RD over Helena Valley Canal

Good

Lewis and Clark County, Montana · 5M E Helena · Structure no. S00430004+07731

Built
2009
16 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
53 ft
1 main span
Daily traffic
4,835
2023 count
Owner
State
State Highway Agency

About this bridge

Canyon Ferry RD over Helena Valley Canal is a prestressed concrete stringer/multi-beam or girder carrying Canyon Ferry RD over Helena Valley Canal in Lewis and Clark County, Montana. It was built in 2009, so it is 16 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 4,835 vehicles a day, projected to reach 5,101 by 2043. The structure is 53 ft (16.3 m) long and 41 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCanyon Ferry RD
CrossesHelena Valley Canal
Location5M E Helena
RouteState Highway 5818
CountyLewis and Clark County
StateMontana
Coordinates46.61718, -111.87917
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 inspectionMarch 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 rating71 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length53 ft (16.3 m)
Longest span51 ft (15.5 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,835 (2023)
Projected traffic5,101 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Canyon Ferry RD over Helena Valley Canal built?

It was built in 2009, making it 16 years old in 2025.

What condition is Canyon Ferry RD 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 March 2024.

How much traffic does Canyon Ferry RD over Helena Valley Canal carry?

About 4,835 vehicles per day (2023 count).

How long is Canyon Ferry RD over Helena Valley Canal?

The structure is 53 ft (16.3 m) long with a longest span of 51 ft (15.5 m) and a deck 41 ft wide.

Who owns Canyon Ferry RD over Helena Valley Canal?

It is owned by the State Highway Agency.