Thanks Jeff for bringing in Adam's article. It was written a few years ago so I hope he would forgive me if I point out a couple items.
Colt made three trips (1922, 1913, 1914). OE in 1913. And OE was not the only course with Colt and Ross together in America. On the same trip Colt designed nearby Indian Hill (Winnetka) ostensibly with barker. As pre OE all the drawings were done by Colt. Ross was "charged with the bunkers" and built the course, again similar to OE. The Colt drawings I've seen shows all the bunkers designed in detail and even today's aerial will confirm many of those still exist.
In addition The Country Club of Detroit's first course on their current Grosse Pointe Farms site was designed by Colt and built in 1911 without Ross. However, on his return trips he renovated it for the 1915 US Amateur. His "associate" at the time for the renovation was Donald Ross. As mentioned Colt very rarely saw his American courses built, but one exception was The CCD. Several news articles of the time refer to Ross coming back a couple times to be sure that the tees and bunkers added for the Amateur were done according to Colt's plan.
In a minor response to Tom, Colt was the older partner in all four CMA&M partnership variations and they all came up against a couple world wars and the Depression. Traveling the world ws little tougher and when you have Alison and Morrison willing to travel to the farthest points of the world why not stick to Europe?
For my two cents, I consider Colt top ten, but I also add Alison in that group as the American and Japanese work were essentially done on his own.
Anthony