US Bridges

Csah 8 over Mound Creek

PoorPosted for load

Rock County, Minnesota · 0.2 MI S of JCT Csah 19 · Structure no. 92759

Built
1960
65 years old
Condition
Poor
inspected October 2024
Type
Slab
Wood or Timber
Length
37 ft
2 main spans
Daily traffic
454
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 8 over Mound Creek is a wood or timber slab carrying Csah 8 over Mound Creek in Rock County, Minnesota. It was built in 1960, so it is 65 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. Its operating status is: posted for load restriction.

It carries about 454 vehicles a day, projected to reach 380 by 2042. The structure is 37 ft (11.3 m) long and 30 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesCsah 8
CrossesMound Creek
Location0.2 MI S of JCT Csah 19
RouteCounty Highway 8
CountyRock County
StateMinnesota
Coordinates43.71402, -96.1729
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.3 US tons
Inventory rating22.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadH 20
Structure length37 ft (11.3 m)
Longest span17 ft (5.2 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic454 (2022)
Projected traffic380 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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$102 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 8 over Mound Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Csah 8 over Mound Creek 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 October 2024.

How much traffic does Csah 8 over Mound Creek carry?

About 454 vehicles per day (2022 count).

How long is Csah 8 over Mound Creek?

The structure is 37 ft (11.3 m) long with a longest span of 17 ft (5.2 m) and a deck 30 ft wide.

Who owns Csah 8 over Mound Creek?

It is owned by the County Highway Agency.