US Bridges

Csah 20 over CO Ditch # 66

Fair

Polk County, Minnesota · 0.7 MI S of JCT Csah 21 · Structure no. 60517

Built
1971
54 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Prestressed Concrete
Length
62 ft
2 main spans
Daily traffic
1,011
2021 count
Owner
County
County Highway Agency

About this bridge

Csah 20 over CO Ditch # 66 is a prestressed concrete channel beam carrying Csah 20 over CO Ditch # 66 in Polk County, Minnesota. It was built in 1971, so it is 54 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 1,011 vehicles a day, projected to reach 950 by 2041. The structure is 62 ft (18.9 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 20
CrossesCO Ditch # 66
Location0.7 MI S of JCT Csah 21
RouteCounty Highway 20
CountyPolk County
StateMinnesota
Coordinates48.01136, -96.78409
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34.6 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span30 ft (9.1 m)
Deck width38 ft (11.6 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,011 (2021)
Projected traffic950 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 CO Ditch # 66 built?

It was built in 1971, making it 54 years old in 2025.

What condition is Csah 20 over CO Ditch # 66 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 20 over CO Ditch # 66 carry?

About 1,011 vehicles per day (2021 count).

How long is Csah 20 over CO Ditch # 66?

The structure is 62 ft (18.9 m) long with a longest span of 30 ft (9.1 m) and a deck 38 ft wide.

Who owns Csah 20 over CO Ditch # 66?

It is owned by the County Highway Agency.