US Bridges

Csah 15 over Red Lake River

FairPosted for load

Polk County, Minnesota · 0.1 MI W of JCT Csah 61 · Structure no. 60505

Built
1968
57 years old
Condition
Fair
inspected October 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
1,226 ft
2 main spans
Daily traffic
477
2022 count
Owner
County
County Highway Agency

About this bridge

Csah 15 over Red Lake River is a steel continuous girder and floorbeam system carrying Csah 15 over Red Lake River in Polk County, Minnesota. It was built in 1968, so it is 57 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 477 vehicles a day, projected to reach 520 by 2042. The structure is 1,226 ft (373.6 m) long and 34 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

CarriesCsah 15
CrossesRed Lake River
Location0.1 MI W of JCT Csah 61
RouteCounty Highway 15
Coordinates47.80065, -96.80936
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.4 US tons
Inventory rating15.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+15 approach)
Design loadH 20
Structure length1,226 ft (373.6 m)
Longest span130 ft (39.6 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic477 (2022)
Projected traffic520 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 15 over Red Lake River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Csah 15 over Red Lake 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 October 2024.

How much traffic does Csah 15 over Red Lake River carry?

About 477 vehicles per day (2022 count).

How long is Csah 15 over Red Lake River?

The structure is 1,226 ft (373.6 m) long with a longest span of 130 ft (39.6 m) and a deck 34 ft wide.

Who owns Csah 15 over Red Lake River?

It is owned by the County Highway Agency.