US Bridges

Csah 116 over Portage River

Fair

St. Louis County, Minnesota · 0.3 MI E of JCT CR670 · Structure no. 7776

Built
1953
72 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
72 ft
2 main spans
Daily traffic
325
2019 count
Owner
County
County Highway Agency

About this bridge

Csah 116 over Portage River is a steel stringer/multi-beam or girder carrying Csah 116 over Portage River in St. Louis County, Minnesota. It was built in 1953, so it is 72 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.

It carries about 325 vehicles a day, projected to reach 240 by 2039. The structure is 72 ft (21.9 m) long and 26 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

Location

Open in Google Maps
CarriesCsah 116
CrossesPortage River
Location0.3 MI E of JCT CR670
RouteCounty Highway 116
CountySt. Louis County
StateMinnesota
Coordinates48.1028, -92.06649
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.6 US tons
Inventory rating35.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length72 ft (21.9 m)
Longest span34 ft (10.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic325 (2019)
Projected traffic240 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 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$253 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Csah 116 over Portage River built?

It was built in 1953, making it 72 years old in 2025.

What condition is Csah 116 over Portage 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 June 2023.

How much traffic does Csah 116 over Portage River carry?

About 325 vehicles per day (2019 count).

How long is Csah 116 over Portage River?

The structure is 72 ft (21.9 m) long with a longest span of 34 ft (10.4 m) and a deck 26 ft wide.

Who owns Csah 116 over Portage River?

It is owned by the County Highway Agency.