US Bridges

Csah 25 over Dark River

Poor

St. Louis County, Minnesota · 4.0 MI N of JCT CSAH66 · Structure no. 7689

Built
1940
85 years old
Condition
Poor
inspected September 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
365
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 25 over Dark River is a concrete culvert carrying Csah 25 over Dark River in St. Louis County, Minnesota. It was built in 1940, so it is 85 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 365 vehicles a day, projected to reach 330 by 2039. The structure is 22 ft (6.8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCsah 25
CrossesDark River
Location4.0 MI N of JCT CSAH66
RouteCounty Highway 25
CountySt. Louis County
StateMinnesota
Coordinates47.63039, -92.76395
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32.4 US tons
Inventory rating25.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.8 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 traffic365 (2019)
Projected traffic330 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$1,000 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 25 over Dark River built?

It was built in 1940, making it 85 years old in 2025.

What condition is Csah 25 over Dark River 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 September 2024.

How much traffic does Csah 25 over Dark River carry?

About 365 vehicles per day (2019 count).

How long is Csah 25 over Dark River?

The structure is 22 ft (6.8 m) long with a longest span of 10 ft (3 m).

Who owns Csah 25 over Dark River?

It is owned by the County Highway Agency.