Lindbergh did use a float plane. There's the great story back home -- I'm from Cushing, Maine; and South Warren, Maine is the adjacent town on U.S. Route #1. Just before the Warren/Thomaston town line, at the top of the hill was Spear's Garage. It was a typical roadside garage with the Flying A Tydol/Veedol gasoline sign out front. The town line is adjacent to a narrow section of the St. George River.
After Lindbergh had become famous he was on one of his many flights to North Haven Island to visit his hosts, the U.S. Ambassador Dwight Morrow whose daughter Anne was the apple of Charles' eye and later became Anne Morrow Lindbergh.
It seemed that fuel was running low in the Lindbergh plane. Being familiar with the terrain he set her down on the stretch of St. George River. Now Cliffuhd Speahh was a slow-tokkin' fella known for miles around, and was sittin' in the garage with his feet up on his desk. C. L. had walked up the grassy hill and appeared through the door of the garage.
"Excuse me Sir, but my name is Charles Lindbergh and I'm on my way to visit friends on North Haven Island. My aeroplane has run low on fuel and I've landed on the river. Could I bother you to get some fuel and could I perhaps use your telly to call my hosts to let them know I'll be slightly delayed?"
The above was 14 or 15 years before I was born, but I can still hear the gaiety in the voices of relatives(and their friends of that generation) relate the story. "Cliff" wasn't a fast mover -- or speaker -- and as the story goes he hesitated a bit, then looked from under his visor-ed cap and said, "Who'd you say you was?" To which the response came, "I'm Mr. Charles Lindbergh."
There was a pronounced delay until "Cliff" drawled, "And I'm George Washnton; telly's in the cornuh." Several trips across the field with gas cans satisfied the need and Lindbergh was again on his way.
My Dad grew up with the younger generation Spear and I grew up with his three offspring. Every one of them had the
same speech pattern, including Clifford's
brother Alvah who managed the local roller skating rink I used during my teen years.
HR
[EDIT]
http://www.zillow.com/homedetails/607-Cushing-Rd-Warren-ME-04864/112659911_zpid/
Bring up the "Map" illustration. Then scroll the map to see more at the top of it. Spear's Garage was -- still is but has been falling down for years -- inside the junction of Atlantic Highway and Cushing Road. Where the river is shown, the landing was on the north side of the bridge.