Representatives of water agencies from across the West convened here this week for their annual Colorado River meetings, focusing on finishing a drought plan to prevent the levels of reservoirs from continuing to drop. Many of the water managers said they’re looking to Arizona to finish negotiating the details of its plan so the state can sign on and make possible a larger deal aimed at preventing Lake Mead from falling further. Federal officials had expressed hopes that Arizona, California and Nevada would iron out remaining issues and be ready to sign the Lower Basin Drought Contingency Plan at the Las Vegas conference.