US Bridges

Csah 40 over Sucker River

Poor

St. Louis County, Minnesota · 0.1 MI N of JCT CR258 · Structure no. 7701

Built
1938
87 years old
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
145
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 40 over Sucker River is a steel stringer/multi-beam or girder carrying Csah 40 over Sucker River in St. Louis County, Minnesota. It was built in 1938, so it is 87 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 145 vehicles a day, projected to reach 160 by 2039. The structure is 41 ft (12.4 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCsah 40
CrossesSucker River
Location0.1 MI N of JCT CR258
RouteCounty Highway 40
CountySt. Louis County
StateMinnesota
Coordinates46.96902, -91.92131
Functional classRural Local

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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 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
Deck geometry4: 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 rating47.8 US tons
Inventory rating28.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length41 ft (12.4 m)
Longest span37 ft (11.4 m)
Deck width26 ft (7.9 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic145 (2019)
Projected traffic160 by 2039
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$184 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 40 over Sucker River built?

It was built in 1938, making it 87 years old in 2025.

What condition is Csah 40 over Sucker 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 August 2024.

How much traffic does Csah 40 over Sucker River carry?

About 145 vehicles per day (2019 count).

How long is Csah 40 over Sucker River?

The structure is 41 ft (12.4 m) long with a longest span of 37 ft (11.4 m) and a deck 26 ft wide.

Who owns Csah 40 over Sucker River?

It is owned by the County Highway Agency.