US Bridges

Csah 20 over Clearwater River

Fair

Red Lake County, Minnesota · 1.0 MI W of JCT CR 118 · Structure no. 63504

Built
1975
50 years old
Condition
Fair
inspected November 2023
Type
Slab
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
50
2014 count
Owner
County
County Highway Agency

About this bridge

Csah 20 over Clearwater River is a prestressed concrete slab carrying Csah 20 over Clearwater River in Red Lake County, Minnesota. It was built in 1975, so it is 50 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.

It carries about 50 vehicles a day, projected to reach 50 by 2039. The structure is 120 ft (36.6 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCsah 20
CrossesClearwater River
Location1.0 MI W of JCT CR 118
RouteCounty Highway 20
CountyRed Lake County
StateMinnesota
Coordinates47.87655, -96.07604
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.3 US tons
Inventory rating39.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span40 ft (12.2 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2014)
Projected traffic50 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Csah 20 over Clearwater River built?

It was built in 1975, making it 50 years old in 2025.

What condition is Csah 20 over Clearwater River 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 November 2023.

How much traffic does Csah 20 over Clearwater River carry?

About 50 vehicles per day (2014 count).

How long is Csah 20 over Clearwater River?

The structure is 120 ft (36.6 m) long with a longest span of 40 ft (12.2 m) and a deck 36 ft wide.

Who owns Csah 20 over Clearwater River?

It is owned by the County Highway Agency.