US Bridges

Skalkaho HWY over Republican Ditch 063

Fair

Ravalli County, Montana · 3M S Hamilton · Structure no. L41300001+01001

Built
1941
84 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
27 ft
1 main span
Daily traffic
3,100
2023 count
Owner
State
State Highway Agency

About this bridge

Skalkaho HWY over Republican Ditch 063 is a wood or timber stringer/multi-beam or girder carrying Skalkaho HWY over Republican Ditch 063 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 fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,100 vehicles a day, projected to reach 3,255 by 2043. The structure is 27 ft (8.2 m) long and 28 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

Open in Google Maps
CarriesSkalkaho HWY
CrossesRepublican Ditch 063
Location3M S Hamilton
RouteState Highway 81024
CountyRavalli County
StateMontana
Coordinates46.19699, -114.1483
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2023)
Projected traffic3,255 by 2043
Trucks0%
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 Republican Ditch 063 built?

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

What condition is Skalkaho HWY over Republican Ditch 063 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does Skalkaho HWY over Republican Ditch 063 carry?

About 3,100 vehicles per day (2023 count).

How long is Skalkaho HWY over Republican Ditch 063?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 28 ft wide.

Who owns Skalkaho HWY over Republican Ditch 063?

It is owned by the State Highway Agency.