US Bridges

Csah 4 over Clearwater River (dam)

FairPosted for load

Clearwater County, Minnesota · 1.8 MI S of JCT Csah 11 · Structure no. 4992

Built
1931
94 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
2 main spans
Daily traffic
275
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 4 over Clearwater River (dam) is a steel stringer/multi-beam or girder carrying Csah 4 over Clearwater River (dam) in Clearwater County, Minnesota. It was built in 1931, so it is 94 years old, older than the Minnesota average of 38.5 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. Its operating status is: posted for load restriction.

It carries about 275 vehicles a day, projected to reach 235 by 2039. The structure is 65 ft (19.8 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesCsah 4
CrossesClearwater River (dam)
Location1.8 MI S of JCT Csah 11
RouteCounty Highway 4
CountyClearwater County
StateMinnesota
Coordinates47.73522, -95.20672
Functional classRural Major 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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.2 US tons
Inventory rating20.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length65 ft (19.8 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2019)
Projected traffic235 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$451 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 4 over Clearwater River (dam) built?

It was built in 1931, making it 94 years old in 2025.

What condition is Csah 4 over Clearwater River (dam) 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 October 2023.

How much traffic does Csah 4 over Clearwater River (dam) carry?

About 275 vehicles per day (2019 count).

How long is Csah 4 over Clearwater River (dam)?

The structure is 65 ft (19.8 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns Csah 4 over Clearwater River (dam)?

It is owned by the County Highway Agency.