AMERICAN STREAM by Tom Cherry

When congressional aide Bitsy Palmer dove into the raging Potomic River to rescue a drowning class of kindergartners, she heroically 
sacrificed her own life to save each child! Touched by her valor, a patriotic nymph brought the young woman back to life and gifted her 
with the ability to transform into a living body of water. Using her
 powerful waves of red, white, and blue for good, Bitsy Palmer protects our nation's capital as...THE AMERICAN STREAM!

There's a wealth of comic strips and drawings at Tom's blog!