sentences:  A larger gabion-type dam is located on the middle part of San Juan Creek near the Cañada Gobernadora.Although the dam has silted in and is no longer used for water storage, its roughly drop still poses a problem for migrating steelhead.There are a few water diversion weirs that exist on San Juan tributary streams to divert water for irrigation, ranching and limited municipal uses, but due to limited flows and polluted water, the usefulness of these structures are limited.