Csah 20 over Stream

FairPosted for load

Rock County, Minnesota · 0.4 MI E of JCT CR 66 · Structure no. L2152

Built: 1952; 73 years old
Condition: Fair; inspected October 2024
Type: Culvert; Wood or Timber
Length: 23 ft; 2 main spans
Daily traffic: 266; 2022 count
Owner: County; County Highway Agency

About this bridge

Csah 20 over Stream is a wood or timber culvert carrying Csah 20 over Stream 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 5 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 266 vehicles a day, projected to reach 210 by 2042. The structure is 23 ft (7 m) long. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps

CarriesCsah 20

CrossesStream

Location0.4 MI E of JCT CR 66

RouteCounty Highway 20

CountyRock County

StateMinnesota

Coordinates43.7184, -96.30616

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.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionOctober 2024

Inspection intervalevery 12 months

Operating statusPosted for load restriction

ScourFoundations stable; scour above top of footing

Structural evaluation4: Meets minimum tolerable limits to be left in place as is

Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is

Approach roadway alignment8: Equal to present desirable criteria

Operating rating22 US tons

Inventory rating13.2 US tons

Structure

Structure typeCulvert

MaterialWood or Timber

DeckNot applicable

Main spans2

Design loadUnknown

Structure length23 ft (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 closed14.9 mi (24 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$60 million

NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 20 over Stream built?

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

What condition is Csah 20 over Stream 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 2024.

How much traffic does Csah 20 over Stream carry?

About 266 vehicles per day (2022 count).

How long is Csah 20 over Stream?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns Csah 20 over Stream?

It is owned by the County Highway Agency.