Csah 31 over Rush Creek

Good

Chisago County, Minnesota · 0.2 MI S of JCT Csah 1 · Structure no. 91742

Built: 1978; 47 years old
Condition: Good; inspected September 2022
Type: Culvert; Concrete
Length: 23 ft; 2 main spans
Daily traffic: 678; 2022 count
Owner: County; County Highway Agency

About this bridge

Csah 31 over Rush Creek is a concrete culvert carrying Csah 31 over Rush Creek in Chisago County, Minnesota. It was built in 1978, so it is 47 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 678 vehicles a day, projected to reach 305 by 2042. The structure is 23 ft (6.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCsah 31

CrossesRush Creek

Location0.2 MI S of JCT Csah 1

RouteCounty Highway 31

CountyChisago County

StateMinnesota

Coordinates45.68293, -93.01232

Functional classRural Major Collector

Condition and inspection

Good

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

Component	Rating	Meaning
Channel and channel protection	8 Very Good	No problems noted.
Culvert	7 Good	Some minor problems.

Last inspectionSeptember 2022

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is

Approach roadway alignment7: Better than present minimum criteria

Operating rating59.4 US tons

Inventory rating39.6 US tons

Structure

Structure typeCulvert

MaterialConcrete

DeckNot applicable

Main spans2

Design loadHS 20

Structure length23 ft (6.9 m)

Longest span9 ft (2.6 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic678 (2022)

Projected traffic305 by 2042

Trucks—

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.7 mi (6 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 31 over Rush Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Csah 31 over Rush Creek 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 September 2022.

How much traffic does Csah 31 over Rush Creek carry?

About 678 vehicles per day (2022 count).

How long is Csah 31 over Rush Creek?

The structure is 23 ft (6.9 m) long with a longest span of 9 ft (2.6 m).

Who owns Csah 31 over Rush Creek?

It is owned by the County Highway Agency.