US Bridges

Mn 30 over Rock River

Fair

Pipestone County, Minnesota · 6.7 MI E of Pipestone · Structure no. 6491

Built
1946
79 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
40 ft
3 main spans
Daily traffic
1,823
2021 count
Owner
State
State Highway Agency

About this bridge

Mn 30 over Rock River is a concrete culvert carrying Mn 30 over Rock River in Pipestone County, Minnesota. It was built in 1946, so it is 79 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 1,823 vehicles a day, roughly 14% of them trucks, projected to reach 1,650 by 2041. The structure is 40 ft (12.2 m) long. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesMn 30
CrossesRock River
Location6.7 MI E of Pipestone
RouteState Highway 30
CountyPipestone County
StateMinnesota
Coordinates43.99378, -96.16914
Functional classRural Minor Arterial

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating32.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length40 ft (12.2 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,823 (2021)
Projected traffic1,650 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$100 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Mn 30 over Rock River built?

It was built in 1946, making it 79 years old in 2025.

What condition is Mn 30 over Rock River 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 September 2023.

How much traffic does Mn 30 over Rock River carry?

About 1,823 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is Mn 30 over Rock River?

The structure is 40 ft (12.2 m) long with a longest span of 14 ft (4.3 m).

Who owns Mn 30 over Rock River?

It is owned by the State Highway Agency.