Insect Hatches

Here are some of the major adult insects found on the river and the approximate times they emerge. Keep in mind these times can vary. Included is a link to a representative dry fly tying video for each insect. Remember, there are many possible variations. Hatches on the lower section of the Clear Fork River can occur weeks earlier than on the upper section due to warmer water below Pleasant Hill dam.

Sulfurs

Good between Mother’s Day and Father’s Day. Tying video

Blue Wing Olive

Can start hatching in late March and go until October. Hook sizes 18-22. The later in the year, the smaller they get. Tying video

Light Cahill

The hatch can last only a few weeks but is worth mentioning. They hatch from mid-June to mid-July in hook sizes 14-16. Tying video

Tricos

Best time to find them hatching is at first light until about 10:00 AM from mid-June to about August, but they can hatch until December. Tricos are small: hook sizes 20-24. Tying video

Caddis

Good almost any time of the year. You will need flies with wing colors in light tans to browns, and with body colors of caddis greens, light browns, or tans. Sizes vary from 14-18. The black caddises should be fished in sizes 16-18, and they hatch from late March to mid-May. Tying video

Stonefly

The major stonefly on the lower Clear Fork River is the small Black Stone. They can start hatching in late February and continue to early May. Sizes range from 12-16. Tying video

Midge

Year-round. Almost any typical midge pattern and color will work, but at times the fish can be very selective. Sizes range from 20-32. Tying video

In addition to these dry flies, anglers should also fish with corresponding nymph patterns that match the various hatches