US Bridges

Skalkaho HWY over Canal 058

Poor

Ravalli County, Montana · 3M SE Grantsdale · Structure no. L41300004+07001

Built
1941
84 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
50 ft
2 main spans
Daily traffic
331
2023 count
Owner
State
State Highway Agency

About this bridge

Skalkaho HWY over Canal 058 is a wood or timber stringer/multi-beam or girder carrying Skalkaho HWY over Canal 058 in Ravalli County, Montana. It was built in 1941, so it is 84 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 331 vehicles a day, roughly 1% of them trucks, projected to reach 348 by 2043. The structure is 50 ft (15.3 m) long and 26 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

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CarriesSkalkaho HWY
CrossesCanal 058
Location3M SE Grantsdale
RouteState Highway 38
CountyRavalli County
StateMontana
Coordinates46.18222, -114.07966
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length50 ft (15.3 m)
Longest span25 ft (7.6 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic331 (2023)
Projected traffic348 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed70.2 mi (113 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 Skalkaho HWY over Canal 058 built?

It was built in 1941, making it 84 years old in 2025.

What condition is Skalkaho HWY over Canal 058 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Skalkaho HWY over Canal 058 carry?

About 331 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Skalkaho HWY over Canal 058?

The structure is 50 ft (15.3 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.

Who owns Skalkaho HWY over Canal 058?

It is owned by the State Highway Agency.