US Bridges

384 Spar Lake Rd. over Spar CR

Poor

Lincoln County, Montana · 2.1 MI Past Campground · Structure no. 011404000000192

Built
1955
70 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
40 ft
1 main span
Daily traffic
10
1994 count
Owner
Federal
U.S. Forest Service

About this bridge

384 Spar Lake Rd. over Spar CR is a wood or timber stringer/multi-beam or girder carrying 384 Spar Lake Rd. over Spar CR in Lincoln County, Montana. It was built in 1955, so it is 70 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 2 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 10 vehicles a day, projected to reach 15 by 2045. The structure is 40 ft (12.2 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

Location

Open in Google Maps
Carries384 Spar Lake Rd.
CrossesSpar CR
Location2.1 MI Past Campground
RouteFederal Lands Road 384
CountyLincoln County
StateMontana
Coordinates48.24358, -115.95842
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; extensive scour has occurred
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (1994)
Projected traffic15 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 384 Spar Lake Rd. over Spar CR built?

It was built in 1955, making it 70 years old in 2025.

What condition is 384 Spar Lake Rd. over Spar CR 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 July 2024.

How much traffic does 384 Spar Lake Rd. over Spar CR carry?

About 10 vehicles per day (1994 count).

How long is 384 Spar Lake Rd. over Spar CR?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 15 ft wide.

Who owns 384 Spar Lake Rd. over Spar CR?

It is owned by the U.S. Forest Service.