So much rain has fallen that high-flow releases at dams are necessary. The US Army Corps of Engineers began releasing water at the Coyote Valley Dam at Lake Mendocino near Ukiah Monday so the lake can take in more rainfall this season. Lake Mendocino was below 38-thousand acre-feet around Christmas but was up to over 95-thousand acre-feet by Monday. The area has seen a huge amount of rain in the past few weeks. Nearly 19 inches of rain has fallen at the Charles M. Schulz-Sonoma County Airport, while the Venado weather station west of Healdsburg got just under 24 inches, and Austin Creek, just north of Guerneville, recorded just under 30 inches.