Studies indicate that the effects of alcohol and drugs are more pronounced when operating a boat.
It is unlawful to operate a recreational vessel while under the influence of alcohol or drugs. All vessels must be registered and numbered except boats propelled manually, sail boats eight feet or less in length without other means of propulsion, and certain public vessels. Out of state registration is valid for 90 days. In addition, some boats, such as houseboats, require a Forest Service permit to be on the lake in excess of 30 days per calendar year. This restriction applies primarily to boats equipped for overnight use.