US Bridges

Csah 20 over Little Beaver Creek

Fair

Rock County, Minnesota · 0.5 MI W of JCT Csah 11 · Structure no. L2154

Built
1952
73 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
266
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 20 over Little Beaver Creek is a concrete culvert carrying Csah 20 over Little Beaver Creek in Rock County, Minnesota. It was built in 1952, so it is 73 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 266 vehicles a day, projected to reach 210 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesCsah 20
CrossesLittle Beaver Creek
Location0.5 MI W of JCT Csah 11
RouteCounty Highway 20
CountyRock County
StateMinnesota
Coordinates43.71832, -96.26324
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.4 US tons
Inventory rating36.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic266 (2022)
Projected traffic210 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$135 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 20 over Little Beaver Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is Csah 20 over Little Beaver Creek 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 Little Beaver Creek carry?

About 266 vehicles per day (2022 count).

How long is Csah 20 over Little Beaver Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Csah 20 over Little Beaver Creek?

It is owned by the County Highway Agency.