this is from TNF service cave creek ranger dist website, says SB cove ramp closed (which happens every year) as they use water from the verde side till about April. You might want to confirm that boat ramps are closed the main ramp normally still has water for quite a while after the SB ramp closes. That announcement was just yesterday
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Yellow Cliffs Boat Dock/Boat Ramp-Closed
Date(s): Feb 16, 2018
Yellow Cliffs Boat Dock and boat ramp, at Bartlett Lake, is closed because the water level has dropped to an unsafe level. The dock and ramp will reopen when the lake levels rise enough to safely reopen.