Fly fishing the Guadalupe below Canyon Dam: what the lure rule means for flies

Fly fishers have an easy time with the Guadalupe's artificial-lure rule at first glance: a fly is an artificial lure. TPWD's definitions page says so in as many words, defining an artificial lure as a man-made lure, flies included, with a hook or hooks attached, used as bait. The rule gets more interesting when you look at what is allowed on that lure, and at how a trout fly differs from a bass jig.

What the rule says

TPWD's Guadalupe page says all trout harvested in the two special sections must be caught on artificial lures. Its legal devices page describes it for pole and line along the stretch that runs from 800 yards below the Canyon Dam release through the second bridge crossing on River Road: rainbow and brown trout may not be retained when taken by any method other than artificial lures. It adds that the lures may not contain or have attached any living or dead organisms (fish, crayfish, insects, worms), any other animal or vegetable material, or any synthetic scented materials, and it says hair or feathers are allowed.

Both TPWD pages tie the rule to trout that are kept, and neither one says anything about a trout you release. They also say nothing we found about barbless hooks. If you are unsure whether a particular fly, a scented gel, or a hook-and-bait combination is allowed, ask TPWD before you fish; do not rely on a guide or a forum.

What that means for your fly box

• TPWD names hair and feathers as allowed on the lure.
• A fly with a real bait attached (a piece of worm, a fish egg, an insect) is not allowed on a lure under that rule, even if the hook is a fly hook.
• A synthetic scented material is excluded, so a scented gel or a fly dipped in a scent product is a question to settle with TPWD before you keep a fish caught on it.
• Wool, cotton, silk and cork are natural materials, and the rule also excludes "other animal or vegetable material." Whether a particular tying material counts is a question for TPWD; a pattern tied from synthetic fiber with no scent added is the plainer choice.

Reading the water for a rig

Rainbows below a large dam live in the cool water the release provides. TPWD says rainbow trout do best where the water stays under 70°F and that some survive below dams such as the one at Canyon Reservoir. In clear water a lighter tippet and a smaller marker help, and long, slow pools reward a quiet approach. Seams and the head of a pool are where the current carries food past the fish.

A starting rig

• A nymph or an egg pattern under a small indicator, with a second nymph below it on a short length of tippet. Our strike indicators guide covers sizing the marker and setting the depth.
• A heavier fly or a little weight (our weights guide) when the water is deep or moving; remember to remove weight when you want a shallow, quiet pool.
• A small streamer, stripped slowly, when nymphing is not working or when you want to cover water.
• A tippet as fine as you can handle for the water clarity, and a leader that turns the fly over.

A purple streamer from our fly box. Check any tying material against TPWD's lure rule before you keep a trout caught on it. Photo: TexCast.

Change one thing at a time (depth, then fly, then speed) so you know what made the difference.

Wading and handling

Limestone ledges on this river are slick with algae, and the water is cold. Our waders and boots guide and the cold water dressing guide go into the gear. If you are releasing a trout, keep it in the water, wet your hands, and hold it in the current until it swims away.

TPWD's Guadalupe, definitions and legal devices pages, read November 10, 2026, are the authority for this section of river. This guide is general information, not legal advice, and the rules can change.

Related guides

• The Guadalupe below Canyon Dam: Trout Zone 1 and Zone 2, in plain words
• Fly fishing strike indicators
• Flies from our box: egg, nymph, popper, hopper, streamer and worm
• Fly fishing weights
• Reading the Guadalupe's flow before you wade
• Waders and wading boots for Texas trout water

Agency pages this guide draws on

• TPWD: Definitions (valid Sep. 1, 2026 through Aug. 31, 2027) (checked 2026-11-10)
• TPWD: Legal Devices for Fish (valid Sep. 1, 2026 through Aug. 31, 2027) (checked 2026-11-10)
• TPWD: Guadalupe River trout fishing (read Nov. 10, 2026) (checked 2026-11-10)
• TPWD: Rainbow Trout (Oncorhynchus mykiss) fact sheet (checked 2026-11-10)

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