The Russian River, one of California’s most iconic waterways, flows approximately 110 miles from its headwaters in the Coast Range near Mendocino to its estuary at Jenner, where it meets the Pacific Ocean. The river drains a vast watershed of about 1,485 square miles, encompassing diverse ecosystems ranging from dense forests to agricultural lands. Annual rainfall in the watershed varies significantly, ranging from 40 inches in lower areas to over 80 inches in higher elevations, with most precipitation occurring during winter months.

The Russian River estuary spans approximately 2 miles and serves as a critical habitat for coho salmon, steelhead trout, and numerous other aquatic species. Seasonal sandbar formations at the river’s mouth frequently close the estuary, creating a lagoon system. These closures impact water quality, habitat conditions, and flooding dynamics, which can affect both wildlife and nearby communities.

Real-time water level monitoring in the Russian River estuary provides essential data to track the timing and frequency of mouth closures, assess upstream flooding risks, and support habitat restoration efforts. This information plays a key role in ensuring the long-term health and resilience of this vital coastal ecosystem.