The Rockaway River is a significant waterway in northern New Jersey, originating in the highlands of Morris County and flowing generally southeast for approximately 35 miles before joining the Passaic River near Parsippany-Troy Hills. Its major tributaries include Beaver Brook and Den Brook. The river offers diverse paddling opportunities, ranging from peaceful flatwater sections to challenging whitewater. The most popular flatwater stretch runs from Denville to Boonton, a scenic 6-7 mile route perfect for canoes and recreational kayaks. This section provides a tranquil experience through wooded areas, ideal for beginners and intermediate paddlers.

For experienced whitewater enthusiasts, the Boonton Gorge section presents a thrilling Class IV-V challenge. This intense 0.7-2 mile stretch drops at an impressive rate of 120 feet per mile, creating a continuous series of difficult rapids. While local authorities have recently discouraged paddling here, it remains a draw for skilled kayakers. The river's difficulty ranges from Class I flatwater to Class V whitewater, requiring varying levels of skill depending on the section. Paddlers should always assess their abilities and the current conditions before embarking.

Spring typically offers the best water levels for paddling, especially for the whitewater sections. Summer can provide pleasant conditions for flatwater trips, though low water levels may affect some areas during dry periods.

The Rockaway River corridor supports a diverse ecosystem, home to various fish species, waterfowl, and riparian vegetation. Paddlers may spot great blue herons, bald eagles, and painted turtles along their journey. Key landmarks include the historic Boonton Falls and the remnants of the Morris Canal, which parallel portions of the river. The river played a crucial role in the region's industrial development, powering mills and factories in the 19th century.

Popular access points include Gardner Field in Denville and Griffith Park in Boonton Township. These locations offer convenient put-in and take-out spots for day trips.

Safety considerations are paramount, especially for the Boonton Gorge section. All paddlers should wear appropriate safety gear and be aware of potential hazards such as strainers and high water conditions. Local regulations should be checked before paddling, particularly regarding access points and permitted activities.

While primarily suited for day trips, multi-day adventures can be planned by combining the Rockaway with connected waterways like the Passaic River, offering extended exploration opportunities for more ambitious paddlers.