US Bridges

Cliff Lake RD over Madison River 045

Fair

Madison County, Montana · 36M S Ennis · Structure no. L29204000+06001

Built
2001
24 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
178 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Cliff Lake RD over Madison River 045 is a steel truss - thru carrying Cliff Lake RD over Madison River 045 in Madison County, Montana. It was built in 2001, so it is 24 years old, younger 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 6 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 178 ft (54.2 m) long and 21 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCliff Lake RD
CrossesMadison River 045
Location36M S Ennis
RouteCounty Highway 29204
CountyMadison County
StateMontana
Coordinates44.83096, -111.51429
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length178 ft (54.2 m)
Longest span178 ft (54.2 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6 m)
Vertical clearance over deck13 ft (4.1 m)

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cliff Lake RD over Madison River 045 built?

It was built in 2001, making it 24 years old in 2025.

What condition is Cliff Lake RD over Madison River 045 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 June 2024.

How much traffic does Cliff Lake RD over Madison River 045 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Cliff Lake RD over Madison River 045?

The structure is 178 ft (54.2 m) long with a longest span of 178 ft (54.2 m) and a deck 21 ft wide.

Who owns Cliff Lake RD over Madison River 045?

It is owned by the County Highway Agency.