Which factor is NOT used when evaluating ice integrity?

• A. Thickness
• B. Air temperature
• C. Color
• D. Cracks

Answer: (B)

Evaluating ice integrity relies on direct, observable indicators of the ice itself rather than the weather outside. Thickness is the core physical measure—more thickness generally means greater load-bearing capacity, though it isn’t foolproof on its own. Cracks are a clear warning sign; where there are fractures, the ice strength is compromised and the risk of failure increases. Color tells you about the ice’s internal structure—clear blue ice is typically denser and stronger, while white or opaque ice indicates trapped air or snow inclusions and usually weaker, more prone to failure.

Ambient air temperature, while it influences how ice forms and melts over time, is not a direct metric of the ice’s current strength. You wouldn’t rely on temperature alone to judge safety; you assess the ice with thickness, cracks, and color (plus other on-ice signs) to determine integrity.