Here is a site listing short stories and describe the elements that make a good story. It is called the Yale-New Haven Teachers Institute. The lesson plans are intended for upper grades (7-12).
Here is a list of the stories (most if not all can be found online):

Callaghan, Morley. “All the Years of Her Life”.
Doyle, Sir Arthur Conan. “The Red-Headed League”.
Jackson, Shirley. “The Lottery”.
Kipling, Rudyard. “Rikki-tikki-tavi”.
London, Jack. “To Build a Fire”.
Poe, Edgar Allan. “The Cask of Amontillado”.
Saki. “The Open Window”.
Thurber, James. “The Secret Life of Walter Mitty”.
Bierce, Ambrose. “An Occurrence at Owl Creek Bridge”.
Connell, Richard. “The Most Dangerous Game”.
deMaupassant, Guy. “The Necklace”.
0. Henry. “The Gift of the Magi”.
Stockton, Frank R. “The Lady, or the Tiger”.
Twain, Mark. “The Californian’s Tale”.