Whether it’s a green, yellow or red flag, Dawn Hinz who manages the flag warning system in South Haven said no water is guaranteed to be safe.

If you see a single flag that's half red and half yellow, the area you're in is among the safest on the beach. The flags indicate an area is protected by lifeguards and is being closely supervised.

Michigan introduces double red flags to beach warning system: ... Green flag = low hazard. Go. Calm conditions. Enter the water, but — as always — exercise caution. Yellow flag = medium hazard ...