Welcome to Tuolumne-Stanislaus Integrated Regional Water Management Authority

The T-Stan Integrated Regional Water Authority oversees the TS-IRWM Plan.  The Plan is the first regional watershed management plan of its kind in the Tuolumne-Stanislaus Region and is intended to provide a framework to improve collective understanding and take high priority actions to collaboratively address the many major water-related challenges/needs and conflicts within the Region through the planning horizon. These issues include water quality, local water supply reliability, better integration of water and land use management, resource stewardship and ecosystem protection. The array of goals, objectives, selected resource management strategies, and prioritized projects in this Plan represent a collective view of how to improve integrated water management throughout the Region. The Region's boundaries encompass approximately 2,700 square miles, spanning the western slope of the Sierra Nevada, rising from the lower Sierra foothills to the crest of the Sierra Nevada and includes the Upper Tuolumne River, Upper Stanislaus River, and Upper Rock Creek-French Camp Slough watersheds. The Region includes all of Tuolumne County, the southern portion of Calaveras County, and southwestern Alpine County.