US Bridges

Csah 15 over Twelve Mile Creek

Good

Traverse County, Minnesota · 0.5 MI N of JCT Csah 8 · Structure no. 92784

Built
1971
54 years old
Condition
Good
inspected September 2021
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
150
2016 count
Owner
County
County Highway Agency

About this bridge

Csah 15 over Twelve Mile Creek is a concrete culvert carrying Csah 15 over Twelve Mile Creek in Traverse County, Minnesota. It was built in 1971, so it is 54 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 150 vehicles a day, projected to reach 150 by 2039. The structure is 29 ft (8.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesCsah 15
CrossesTwelve Mile Creek
Location0.5 MI N of JCT Csah 8
RouteCounty Highway 15
Coordinates45.68966, -96.29552
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.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating39.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length29 ft (8.7 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2016)
Projected traffic150 by 2039
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 15 over Twelve Mile Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Csah 15 over Twelve Mile 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 2021.

How much traffic does Csah 15 over Twelve Mile Creek carry?

About 150 vehicles per day (2016 count).

How long is Csah 15 over Twelve Mile Creek?

The structure is 29 ft (8.7 m) long with a longest span of 13 ft (3.9 m).

Who owns Csah 15 over Twelve Mile Creek?

It is owned by the County Highway Agency.