Here’s a polished version of your Tulpehocken Creek description:

Tulpehocken Creek (The "Tully")

Located just outside of Reading, Pennsylvania, Tulpehocken Creek is an exceptional tailwater fishery renowned for its consistent trout fishing. The creek is fed by Blue Marsh Lake, which was created in 1978 by the Army Corps of Engineers as part of a flood control project. The dam’s bottom release system discharges cool, fertile water from depths of up to 50 feet, ensuring that the creek remains cool enough for trout to thrive year-round.

The Tulpehocken Creek (often referred to as the "Tully") stretches 4-5 miles below the dam, where it is home to a healthy population of both brown and rainbow trout. These fish average between 12-14 inches, with many holdovers reaching 13-16 inches, and plenty of trout exceeding 18 inches. The creek is also influenced by two key tributaries that help cool the lower stretches during the hottest summer months, ensuring that trout continue to flourish even when temperatures rise.

In addition to its natural coldwater flow, the Tully benefits from regular stocking. The creek is float-stocked with brown and rainbow trout, and in Spring 2017, it was included in Pennsylvania’s prestigious Keystone Select Program. As part of this program, the creek is now stocked twice each spring with 18-22” brown trout, making it a prime destination for anglers seeking larger fish. With its thriving trout population and excellent fish size per mile, the Tulpehocken Creek is quickly becoming a rival to the Western streams in terms of both quality and quantity of fish.