Mead will be low and cold
Laughlin will be cold and low
Havasu will be a good bet, but if you have trouble you may be a long way from help with no current to get you back.  That will suck.

Parker should be done just to say you did 

Blythe would be my first choice but it is much further south.  Anywhere from Lost Lake to Aja Quin to Blythe in March if a glassy wet dream in late March.  You may not see 5 more boats all day.   From sunup to sundown with nothing but your girl and your ski.          If you like that kind of thing.

Dang it.   I knew I forgot somewhere.
   Mojave is a bitchen lake but March can/will/may be rough.   But it might be ROUGH !

Compared to here in March, it is very warm there ( about 10 to 20 below in March here at home). The ice (6 feet thick) isn't off the lakes here until very end of May at the eariest! The water temp never gets more than about 65 deg.

I will be down with the truck camper, so We are very mobile. Visiting Snowbird Grandparents in Fort Mojave, but willing to go anywhere up and down the River for a couple of days at a time.

You being in Manitoba, I know it's big, you any where near winnepeg