US Bridges

Csah 36 over Rum River

Fair

Mille Lacs County, Minnesota · 0.7 MI S of JCT TH 23 · Structure no. 48002

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
222 ft
4 main spans
Daily traffic
3,150
2018 count
Owner
County
County Highway Agency

About this bridge

Csah 36 over Rum River is a concrete continuous slab carrying Csah 36 over Rum River in Mille Lacs County, Minnesota. It was built in 1988, so it is 37 years old, younger 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 3,150 vehicles a day, projected to reach 2,950 by 2038. The structure is 222 ft (67.8 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCsah 36
CrossesRum River
Location0.7 MI S of JCT TH 23
RouteCounty Highway 36
CountyMille Lacs County
StateMinnesota
Coordinates45.74225, -93.64726
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating69.4 US tons
Inventory rating41.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length222 ft (67.8 m)
Longest span58 ft (17.7 m)
Deck width46 ft (14.1 m)
Roadway width43 ft (13 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,150 (2018)
Projected traffic2,950 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 36 over Rum River built?

It was built in 1988, making it 37 years old in 2025.

What condition is Csah 36 over Rum 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 36 over Rum River carry?

About 3,150 vehicles per day (2018 count).

How long is Csah 36 over Rum River?

The structure is 222 ft (67.8 m) long with a longest span of 58 ft (17.7 m) and a deck 46 ft wide.

Who owns Csah 36 over Rum River?

It is owned by the County Highway Agency.