Planning Your Fly-fishing Trip To Yellowstone
...........................  ......................Fly Fishing Yellowstone National Park

When to Come and What To Expect:

Fly Fishing: Yellowstone National Park - August - Lewis River

The Lewis River Channel runs between Shoshone Lake and Lewis Lake. It is the most
popular section of the Lewis River. It's about a three miles long. It is noted for its large
brown trout that probably average 14 to 18 inches. It can be accessed by boat or by
the Lewis River Trail.

The main section of the Lewis River flows from Lewis Lake into the Snake River. It
varies considerably from its cascade type water below Lewis Lake downstream to the
bridge at the South Entrance Road, to its smooth, flat slower moving water below the
bridge. It then proceeds to fall into a deep canyon. This canyon section is very difficult
to access and for the most part, contains only small fish. It finally levels out to flow
into the Snake River just inside the South Park Boundary.

The smooth section has a lot of large brown trout but they are not easy to catch in the
spring creek like water. The canyon section is very difficult to access because of the
steep walls of the canyon. All in all, the Lewis River Channel provides the better fishing.


August can be tough. There are some hatches that take place, mostly caddisflies and
some Pale Morning Duns. Terrestrials are plentiful, especially along the meadow like
section below the bridge. We have found some large flying ant falls in the smooth
section of water during August that turned the trout on.

If you wanted to fish the Lewis River during August, we would recommend either the
early part for anything other than the channel and the last part of August for the
channel. Large brown trout will be preparing to spawn and normally streamers produce
some good trout near the end of the month of August.

We wouldn't recommend the Lewis River if you traveled there for that sole purpose, but
if you are passing through the South Entrance, camping at one of the lakes, you would
want to consider it.