Quick Answer
To identify safe crevasse crossings, look for a firm, solid bridge of ice or snow that's at least 6 feet wide and spans the gap with no visible sagging, and ideally with two anchors on either side. Assess the ice for any signs of cracking or shearing, and check for any recent avalanches or water flow that could have weakened the ice. Use your judgment and experience to determine if the crossing is safe.
Assessing the Ice
When assessing the ice for a crevasse crossing, look for a solid, blue-colored surface with a uniform texture. This typically indicates that the ice is old and more stable. Avoid areas with white or milky-colored ice, as this can be a sign of new or weak ice. Also, be wary of areas with recent cracks or shearing, as these can indicate a weak point in the ice. Use your crampons and ice axe to test the firmness of the ice, and look for any signs of recent water flow or melting.
Evaluating the Span
When evaluating the span of the crevasse, look for a bridge of ice or snow that’s at least 6 feet wide and spans the gap with no visible sagging. Ideally, the span should have two anchors on either side, such as two separate ice floes or a single ice wall with a solid anchor point. Avoid spans with any signs of sagging or weakness in the middle, as these can indicate that the ice is not stable. Use your judgment and experience to determine if the span is safe.
Crossing Techniques
When crossing a crevasse, always use a rope and safety harness to protect yourself from a fall. If the span is narrow or the ice is weak, consider using a pulley system to distribute your weight more evenly. When stepping onto the span, place your feet on the center of the bridge and use your crampons to dig into the ice for stability. Keep your center of gravity low and use your ice axe to balance yourself, and always keep a firm grip on the rope to prevent a fall.
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