Hellgrammite. Likely a male due to large reddish pinching jaws. Had six legs and additional appendages (feelers) for a total of at least 10. Two hooks on tail end. Individual was approximately 2.5" (6.5 cm) long.
Referencing https://bugguide.net/node/view/4872 this is likely to be C. texanus, but unsure of id.