Great full-size puzzle. As always, loved how you tried to link as much fill as possible to the theme. It made this crossword feel like a balanced and filling meal despite only a Tuesday-level challenge.
Singer Carly ___ Jepsen whose "Call Me Maybe" was the second-most streamed song of 2012
15A
Smelter's waste
16A
What your skin might do if you spend a whole summer day on a 35-Down floating downstream
17A
Middle-Earth monster
18A
Sass, sassily
19A
Manatee
21A
Sold-out letters
22A
On the ocean
23A
24-hr. TV station, which you can stream with ___go
24A
Video game hero who must swim through certain areas of the Mushroom Kingdom
26A
Three-card Monte, e.g.
27A
Put two and two together
28A
56-Across, depicted visually multiple times in this puzzle
29A
Ship's sealant
30A
"A place where the ____ flows like wine, where beautiful women instinctively flock like the salmon of Capistrano" - Lloyd in "Dumb and Dumber"
32A
Yang's complement
33A
Come in
36A
____ a bath
38A
Temp. control system in the home or office
40A
Fishing gear
43A
G sharp, enharmonically
46A
Waterfowl with a color named after it
48A
Feldshuh of "Crazy Ex-Girlfriend" (which you can and should stream on Netflix)
50A
Even a little bit
53A
The Rio Grande flows along its southwestern border
55A
Signal from a sinking ship
56A
11-Down, depicted visually multiple times in this puzzle
59A
Hundred Acre Wood resident who once floated under the bridge during a game of Poohsticks
60A
Socialites, or a noted socialist
Verticales
1D
It might be left in your mouth
2D
Boar Vessel, 600-500 BC, ________, ceramic: much-memed artwork that turned out, sadly, to be a forgery
3D
Novel that won Pearl S. Buck a Pulitzer, with "The"
4D
Tailor's measurement
5D
"Super 24-Across Bros." console
6D
Streambank concern
7D
Like many fast-moving streams
8D
Art ____
10D
Like a kayak in very strong rapids, perhaps
11D
28-Across, depicted visually multiple times in this puzzle
12D
Muscle on display at the beach, for short
13D
Effect used in many instant replays
19D
It stops blood from flowing
20D
Like the skin of an apple
25D
2,297, for Hank Aaron
31D
___ a bath
34D
Hollywood's Mendes or Longoria
35D
Watercraft whose name is (not-so-subtly) hidden in "watercraft"
37D
Possibly like water, but definitely like things in water
39D
It stops blood from flowing
41D
Mid-afternoon meal you might take in the garden
42D
Posed (for a painting)
44D
State confidently
45D
Vehicle for hire
47D
They come in beams, not streams
49D
Possess
51D
____ Star State: nickname for 53-Across
52D
Drug that John Lennon may or may not have been alluding to in a song with lyrics like "Follow her down to a bridge by a fountain / Where rocking horse people eat marshmallow pies / Everyone smiles as you drift past the flowers / That grow so incredibly high"
54D
It might float downstream to expand a plant species's range