US Bridges

Csah 6 over Spring Brook

Poor

Rock County, Minnesota · 0.2 MI S of JCT Csah 4 · Structure no. 92763

Built
1957
68 years old
Condition
Poor
inspected December 2024
Type
Slab
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
920
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 6 over Spring Brook is a wood or timber slab carrying Csah 6 over Spring Brook in Rock County, Minnesota. It was built in 1957, so it is 68 years old, older than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 920 vehicles a day, projected to reach 970 by 2038. The structure is 40 ft (12.3 m) long and 42 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCsah 6
CrossesSpring Brook
Location0.2 MI S of JCT Csah 4
RouteCounty Highway 6
CountyRock County
StateMinnesota
Coordinates43.6148, -96.35236
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating28.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 15
Structure length40 ft (12.3 m)
Longest span19 ft (5.7 m)
Deck width42 ft (12.7 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic920 (2018)
Projected traffic970 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 6 over Spring Brook built?

It was built in 1957, making it 68 years old in 2025.

What condition is Csah 6 over Spring Brook in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2024.

How much traffic does Csah 6 over Spring Brook carry?

About 920 vehicles per day (2018 count).

How long is Csah 6 over Spring Brook?

The structure is 40 ft (12.3 m) long with a longest span of 19 ft (5.7 m) and a deck 42 ft wide.

Who owns Csah 6 over Spring Brook?

It is owned by the County Highway Agency.