The Biden administration has announced a range of options for new rules to address chronic water shortages and low reservoir levels on the Colorado River, a vital water source for seven Western states that has dwindled during more than two decades of drought compounded by climate change.

The Interior Department released four alternatives for new long-term rules aimed at dealing with potential shortages after 2026, when the current operating rules expire. The announcement of the proposed alternatives represents one of the Biden administration’s final steps to outline potential paths toward reaching a consensus among California and the six other states, as well as the region’s 30 Native tribes.