Flat Creek originates in the rugged Gros Ventre Wilderness east of Jackson. At this point it is a small mountain stream. After it flows down onto the flatlands of the National Elk Refuge, it picks up spring water, which provides an ideal environment for trout and their prey. While there are other places to fish, this is the section of Flat Creek that interests most anglers.

This meandering meadow stream has deep undercut banks that provide cover for the wild cutthroats. As the crow flies there are only about three miles of stream but as a fish swims there are probably six miles.

Flat Creek is closed to angling from November 1 to July 31 to protect waterfowl nesting areas, so opening day on Aug. 1 can be busy. After about a week, things calm down and remain steady for the rest of the season.

Access to the stream is through the National Fish Hatchery parking lot, three miles north of Jackson on US Highway 89, or at the highway pullout two miles north of Jackson.