US Bridges

Rocky Butte RD over Crow Creek 070

PoorPosted for load

Lake County, Montana · 2M SW Ronan · Structure no. L24370002+09001

Built
1986
39 years old
Condition
Poor
inspected February 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
30 ft
1 main span
Daily traffic
128
2023 count
Owner
County
County Highway Agency

About this bridge

Rocky Butte RD over Crow Creek 070 is a wood or timber stringer/multi-beam or girder carrying Rocky Butte RD over Crow Creek 070 in Lake County, Montana. It was built in 1986, so it is 39 years old, younger 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. Its operating status is: posted for load restriction.

It carries about 128 vehicles a day, roughly 3% of them trucks, projected to reach 137 by 2043. The structure is 30 ft (9.2 m) long and 24 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesRocky Butte RD
CrossesCrow Creek 070
Location2M SW Ronan
RouteCounty Highway 24274
StateMontana
Coordinates47.49737, -114.14774
Functional classRural Local

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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating27 US tons
Inventory rating19 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length30 ft (9.2 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic128 (2023)
Projected traffic137 by 2043
Trucks3%
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

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 Rocky Butte RD over Crow Creek 070 built?

It was built in 1986, making it 39 years old in 2025.

What condition is Rocky Butte RD over Crow Creek 070 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 February 2024.

How much traffic does Rocky Butte RD over Crow Creek 070 carry?

About 128 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Rocky Butte RD over Crow Creek 070?

The structure is 30 ft (9.2 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns Rocky Butte RD over Crow Creek 070?

It is owned by the County Highway Agency.