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16th Annual Rock CF Rivers Half Marathon

March 21, 2027
Grosse Ile High School
Grosse Ile, MI 48138 US

Race Maps & Nutrition

More detailed maps for each race distance to come! Please see the overview map below.

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Race Day On-Course Nutrition

Mile 2.5- Water & Lemon Lime Gatorade

Mile 4.3- Water & Lemon Lime Gatorade (vanilla, chocolate, tri berry, strawberry banana)

Mile 6.3- Water, Lemon Lime Gatorade & GU (vanilla, chocolate, tri berry, strawberry banana)

Mile 8.4- Water & Lemon Lime Gatorade

Mile 9.5- Water, Lemon Lime Gatorade & GU (vanilla, chocolate, tri berry, strawberry banana)

Mile 11.65 (Mile 1.65 for 5K) - Water

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Schedule of Events

Race Day - Sunday, March 21

Half Marathon & 15K

Start/Finish/Pick Up is located in Grosse Ile High School gym - 7800 Grays Dr, Grosse Ile Township, MI 48138

6:00 am - 7:50 am | Half Marathon & 15K Packet Pick Up

6:00 am | VIP Area Opens

6:00 am | Shuttles start between shuttle parking lots & high school

8:00 am | Half Marathon & 15K Start

11:30 am | Finish Line closes

11:45am | Last Shuttles to shuttle parking lots

15K Finishes near the Grosse Ile Airport


5K Run/Walk

Start Line is located inside of Grosse Ile Airport Naval Air Hangar

Packet Pick Up is located at Grosse Ile Pilot House - 9645 Groh Rd. Grosse Ile, MI

6:00 am – 8:00 am | Packet Pick Up/Registration at Grosse Ile Pilot House

8:15 am | 5K Start

5K Finishes at Grosse Ile High School

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