Marquette, MI – With temperatures turning colder across Michigan’s Upper Peninsula, the National Weather Service (NWS) in Marquette is urging residents to review ice safety guidelines before venturing onto frozen lakes, ponds, or rivers.
Forecasters emphasize that no ice is ever 100% safe, especially early in the winter season when thickness can change quickly. In its Saturday advisory, NWS warned that relying on the belief that ice “has always been good enough” is dangerous and may lead to life-threatening situations.
Officials say ice thickness can vary dramatically over short distances due to shifting temperatures, currents, and wind. Because of this, the agency recommends testing ice thickness every 150 feet when traveling across frozen surfaces. Strongest ice is typically clear with a bluish tint, while weak ice often appears milky or textured from repeated melting and refreezing.
The NWS notes that even during stretches of cold weather, wind-driven currents can create hidden cracks or soft spots that are difficult to see. Residents, anglers, and snowmobilers are encouraged to stay aware of recent and forecast weather conditions before heading out.
General guidelines suggest that a minimum of 4 inches of clear ice is needed for a person on foot, 5–7 inches for a snowmobile or ATV, and 8–12 inches for small vehicles. But the agency stresses that these are only estimates — real safety depends on testing ice directly.
As early-season cold continues across the Upper Peninsula, officials urge caution and preparedness. “If you don’t know, don’t go,” the agency emphasized in its advisory.
