US Bridges

Auto Tour Route over C to B Spillway

Good

Schoolcraft County, Michigan · Sec 29 T45N R13W · Structure no. 000031510-00135

Built
1953
72 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
76 ft
7 main spans
Daily traffic
120
2023 count
Owner
Federal
Bureau of Fish and Wildlife

About this bridge

Auto Tour Route over C to B Spillway is a concrete culvert carrying Auto Tour Route over C to B Spillway in Schoolcraft County, Michigan. It was built in 1953, so it is 72 years old, older than the Michigan average of 48.3 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 120 vehicles a day, roughly 1% of them trucks, projected to reach 120 by 2043. The structure is 76 ft (23.2 m) long and 11 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesAuto Tour Route
CrossesC to B Spillway
LocationSec 29 T45N R13W
RouteFederal Lands Road 0
CountySchoolcraft County
StateMichigan
Coordinates46.26583, -85.95217
Functional classRural Local

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating25 US tons
Inventory rating15 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadUnknown
Structure length76 ft (23.2 m)
Longest span11 ft (3.4 m)
Deck width11 ft (3.4 m)
Roadway width10 ft (3 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic120 (2023)
Projected traffic120 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Fish and Wildlife
Maintained byBureau of Fish and Wildlife
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$736,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Auto Tour Route over C to B Spillway built?

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

What condition is Auto Tour Route over C to B Spillway 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 August 2023.

How much traffic does Auto Tour Route over C to B Spillway carry?

About 120 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Auto Tour Route over C to B Spillway?

The structure is 76 ft (23.2 m) long with a longest span of 11 ft (3.4 m) and a deck 11 ft wide.

Who owns Auto Tour Route over C to B Spillway?

It is owned by the Bureau of Fish and Wildlife.