Nockamixon Swim Challenge

At dawn, morning mist lifts off the mirror-flat surface of Lake Nockamixon, revealing forested shorelines nestled beneath Haycock Mountain. Here, the Steelman Racing Nockamixon Swim Challenge takes place as an open water swimming race in the freshwater expanse of Lake Nockamixon, setting out from the Tohickon Boat Launch in Quakertown, Pennsylvania. Staged in June, the event is organized by Steelman Racing as a fixture of the Steelman Racing Open Water Swim Series. The competition provides three individual distances: a 1-mile swim of 1,609 meters, a 2-mile swim of 3,218 meters, and a 3-mile challenge covering 4,827 meters. Swimmers can also enter a 3-mile relay to tackle the longer lake circuit as a team.

The 2-mile challenge welcomes a broad range of competitors, remaining open to participants from 13 to 80 years of age. Swimmers enter the race through a self-seeded rolling start directly off the dock. On the outward leg of the swim, a slight headwind can stir ripples across the surface, requiring focused sighting toward the buoys. Organizers describe the water as clear, with temperatures resting comfortably in the mid-70s Fahrenheit. After completing their distance, participants gather for a post-race party featuring food and music.

Lake Nockamixon: the dammed basin of Tohickon Creek

Lake Nockamixon is a freshwater reservoir formed by damming Tohickon Creek. The lake was created by purchasing 5,286 acres across the Tohickon Valley, transforming the area into a broad public water body. Three separate streams supply the reservoir, with Tohickon Creek, Haycock Run, and Three Mile Run continuously feeding the basin. These flowing tributaries keep the lake water clean and blue, carrying a faint current that moves gently along the drowned course of Tohickon Creek. Centuries before the dam altered the valley, the Lenape tribe lived along these waterways, referring to the surrounding woodland territory as Tachan Hoking or Achtuhhu Ing. In 1958, Tohickon Creek was dammed to establish the modern reservoir, taking the name Lake Nockamixon from a Lenape phrase that translates to "place of soft soil."

Tohickon Creek downstream: High Rocks and the Delaware confluence

Downstream of the dam, in Bedminster Township, Pennsylvania, Tohickon Creek receives Deer Run. Deer Run originates at an elevation of 390 feet and drains a watershed of 5.51 square miles before reaching its confluence with Tohickon Creek at an elevation of 282 feet. Along the creek lies the High Rocks area, where vertical stone cliffs rise up to 200 feet above the northern edge of the water. While the lake upstream provides still water for the swim challenge, water is released from the Lake Nockamixon dam twice a year, during March and November. These scheduled releases transform the lower creek into an energetic whitewater course, attracting paddlers from across the region to test themselves against the rapids.

About eight kilometres from the race area, the local watershed connects to the Lower Delaware National Wild and Scenic River. Congress officially designated this river system as scenic on November 1, 2000, establishing federal protections across 67.3 miles of waterways. The protected corridors span Northampton and Bucks counties in Pennsylvania, as well as Hunterdon, Mercer, and Warren counties in New Jersey. To keep these waterways in a free-flowing state, federal law prohibits significant development along their shorelines. Under this legislation, the protected segments are classified as either Scenic or Recreational, with no sections designated as Wild. The federal scenic designation includes specific protected segments of Paunnacussing Creek, Tohickon Creek, Tinicum Creek, Rapp Creek, and Beaver Creek.

Among these, Tinicum Creek flows for 10.30 kilometers before entering the Delaware River across from Marshall Island, experiencing an elevation drop of 43 meters from its headwaters. Historic crossings along Tinicum Creek include the Frankenfield Covered Bridge and an aqueduct that carried the Delaware Canal. Beaver Creek begins in Bridgeton Township at an elevation of 540 feet and flows for 3.68 miles before joining Tinicum Creek. The stream descends with an average slope of 85.3 feet per mile as it makes its way down the valley. Also located in Bridgeton Township in Bucks County is Falls Creek, a 1.4-mile tributary of the Delaware River that features the highest waterfall in the county.

Originating near Pennsylvania State Game Lands Number 56 and Ringing Rocks Park, Falls Creek drops approximately 300 feet over a distance of 2,040 feet through its steep waterfall cascade. Further along the Delaware River network, the Musconetcong River flows for 45.7 miles from Lake Hopatcong to join the main Delaware channel. Human habitation in the Musconetcong Valley extends back approximately 12,000 years, anchored by the Plenge Site, an important Paleo-Indian archaeological location on the lower river. During the nineteenth century, the Morris Canal ran along the upper river to transport coal, leaving behind remnants of the canal channel and dam pools that remain visible beside the water today.

Haycock Mountain and the wild shores of Lake Nockamixon

Around Lake Nockamixon, woodland trails wind through the rolling hills that rise above the reservoir. In the heart of winter, the lake water sometimes freezes over. At the dam spillway, the freezing water hardens into an array of unusual colors and shapes, creating a spectacular winter sight before the ice melts away. With the return of late spring, the surface clears to welcome swimmers back to the lake basin. Along the shoreline margins, state park staff have reclaimed former small farm fields and replanted them with native warm-season grasses such as switchgrass and Indiangrass. More than 250 species of birds have been documented across the park's diverse habitats. For open water swimmers returning to the Tohickon Boat Launch, these preserved shores provide a peaceful natural amphitheater where the call of native birds echoes across the water.

Nockamixon State Park around the lake

Lake Nockamixon covers 1,450 acres and is a rest stop for migrating waterfowl as well as a destination for boaters and anglers. Boating is popular on the lake, and the park maintains several marinas and boat rentals. The northern side of the lake is friendly to bike riders and walkers, while the southern side is bike free and suited to horseback riding. In winter the water generally freezes over, which allows ice skating and ice fishing. The park's swimming pool covers 0.5 acres and has slides, fountains and a children's splash area. The park is one of the most popular in southeastern Pennsylvania, and most visitors come in the summer months.