Yellowstone River Located from the southeast corner of the park throughout its length, Yellowstone is renowned for cutthroats averaging 16 to 18 inches and 1 to 2 pounds. These are a good fly-fishing target because they're not discriminating eaters. By the most popular stretch of the Yellowstone, by Sulphur Caldron, the fishing is a dream come true. This section opens July 15. The Yellowstone River continues to offer superior trout fishing after it leaves the park.
Paradise Valley is a favorite stretch for many fly fishers.
Before joining the Yellowstone near Tower, the Lamar flows for 66 miles. It's one of the last streams to clear from spring runoff, and it muddies easily after heavy rains. For best results, fish here in late summer. Be aware that the Lamar can be moody, so move around until you find fish. This river can be very demanding for all but the most experienced fly-fishers.