Additionally , they must find alternate routes to avoid vehicles crossing the Arroyo Grande Creek because it is inhabited by the steelhead trout .
The Park must close off an additional half - mile of the beach between March and October , the plover 's breeding season .
They must find alternate routes to avoid vehicles crossing the Arroyo Grande Creek because it is inhabited by the steelhead trout .
The Park must close off an additional half - mile of the beach between March and October , the plover 's breeding season .