21. Hoff said sourly as he inspected a frozen and withering potato and then tossed it back into the snow pack . 22. This new detail will allow hydrologists to better measure the ground snow pack and forecast spring flooding, Jones said. 23. The snow pack melts throughout the spring and summer months, feeding the many mountain streams and creeks with water. 24. Alternating freezing and thawing created a weak layer on top of an existing snow pack , followed by additional snowfall. 25. These rivers benefit greatly from melted snow pack from the mountains, which feeds the rivers during the growing season. 26. The California Cooperative Snow Surveys posts daily snow pack depths and runoff figures, an invaluable service for farmers and hikers. 27. The worst areas are cities and towns, where sidewalks freeze and snow packs hard underfoot into slippery, icy mounds. 28. Snow pack usually reaches a maximum depth of about 2 feet plus ( 0.7 m ) in late February.29. A snow pack can then be further settled out, or stabilized, by further down slope ski traffic through it. 30. The worst areas are cities and towns, where sidewalks freeze up and snow packs hard underfoot into slippery, icy mounds.