Helgramites are commonly found on the Guadalupe.

Southwest Texas State University Study According to an April, 1998 study done by Southwest Texas State University on the Guadalupe River below Canyon Dam: Scuds+Midges+Mayflies+Caddis flies = 91% of drift. Mayflies and Midges are most common in the evening drift. Caddis fly pupae and larvae are most common in mid-afternoon drift Scuds are most common in the early drift, but are available throughout the day. Blue Wing Olives (#18) and Tricos (#24) are the most common Mayflies. The Speckled and Spotted Sedge (#12 - #16) are the most common Caddis. Midges (#18 - #24) are the most common insect in the drift. 300 Baker Avenue Concord, MA 01742

There is a high population of Damsel Nymphs on the Guadalupe.

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