US Bridges

Moose Lake RD over E Fork Rock Creek 030

Good

Granite County, Montana · 10M SW Porters Corner · Structure no. L20006000+01001

Built
1950
75 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
186
2023 count
Owner
County
County Highway Agency

About this bridge

Moose Lake RD over E Fork Rock Creek 030 is a wood or timber stringer/multi-beam or girder carrying Moose Lake RD over E Fork Rock Creek 030 in Granite County, Montana. It was built in 1950, so it is 75 years old, older 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 186 vehicles a day, roughly 3% of them trucks, projected to reach 199 by 2043. The structure is 31 ft (9.4 m) long and 15 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMoose Lake RD
CrossesE Fork Rock Creek 030
Location10M SW Porters Corner
RouteCounty Highway 20005
StateMontana
Coordinates46.19342, -113.4852
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating82 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width15 ft (4.7 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic186 (2023)
Projected traffic199 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Moose Lake RD over E Fork Rock Creek 030 built?

It was built in 1950, making it 75 years old in 2025.

What condition is Moose Lake RD over E Fork Rock Creek 030 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 July 2024.

How much traffic does Moose Lake RD over E Fork Rock Creek 030 carry?

About 186 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Moose Lake RD over E Fork Rock Creek 030?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 15 ft wide.

Who owns Moose Lake RD over E Fork Rock Creek 030?

It is owned by the County Highway Agency.