I was also going to give that reference to Two-Ocean Creek in NW Wyoming south of Yellowstone Park. It actually starts as a single creek and then splits in to Atlantic and Pacific creeks which finally end up in their respective oceans. So, theoretically, a fish could swim up Pacific Creek to Two Ocean Creek and then down Atlantic Creek.
"Homestake Lake" (above) sits a couple hundred yards east of the Continental Divide. It drains east to the Jefferson River via Homestake Creek. The Jefferson River at Headwaters State Park joins the Gallatin and Madison Rivers to form the Missouri River which then flows to St. Louis where it joins the Mississippi River on its journey to the Gulf of Mexico.
. . . while we're on "Divide" trivia. Take a look at
Triple Divide Peak in Glacier National Park which besides the Atlantic and Pacific drainages, also drains into the Hudson Bay in NE Canada, thus the "triple" divide.