US Bridges

Csah 84 over Shannon River

Good

St. Louis County, Minnesota · 0.3 MI E of JCT Csah 134 · Structure no. 69L05

Built
2022
3 years old
Condition
Good
inspected November 2022
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
720
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 84 over Shannon River is a concrete culvert carrying Csah 84 over Shannon River in St. Louis County, Minnesota. It was built in 2022, so it is 3 years old, younger than the Minnesota average of 38.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 720 vehicles a day, projected to reach 720 by 2039. The structure is 23 ft (7.1 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCsah 84
CrossesShannon River
Location0.3 MI E of JCT Csah 134
RouteCounty Highway 84
CountySt. Louis County
StateMinnesota
Coordinates47.54301, -92.93124
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length23 ft (7.1 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 traffic720 (2019)
Projected traffic720 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 84 over Shannon River built?

It was built in 2022, making it 3 years old in 2025.

What condition is Csah 84 over Shannon River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2022.

How much traffic does Csah 84 over Shannon River carry?

About 720 vehicles per day (2019 count).

How long is Csah 84 over Shannon River?

The structure is 23 ft (7.1 m) long with a longest span of 10 ft (3 m).

Who owns Csah 84 over Shannon River?

It is owned by the County Highway Agency.