The river flows in a highly winding course through valleys between ridges of the Appalachian Mountains. Its upper course is characterized by numerous whitewater rapids and supports a broad range of recreational pursuits including whitewater rafting, kayaking and canoeing. Its lower course forms the heart of the Lehigh Valley, a historically important anthracitecoal and steel-producing region of Pennsylvania. from "Maximilian, Prince of Wied’s Travels in the Interior of North America, during the years 1832–1834" The river rises in the Pocono Mountains of northeastern Pennsylvania, in several ponds in Lehigh Township, Wayne County, approximately southeast of Scranton. It flows initially southwest, through southern Lackawanna County, through Francis E. Walter Reservoir. Near White Haven it turns south, following a zigzag whitewater course through Lehigh Gorge State Park to Jim Thorpe, then southeast, past Lehighton. Southeast of Lehighton, it passes through Blue Mountain in a narrow opening called the Lehigh Gap. From the Lehigh Gap, the river flows southeast to Allentown, where it is joined by Little Lehigh Creek, then northeast past Bethlehem, where it joins the Delaware River in Easton, along Pennsylvania's border with New Jersey. The PA Gazetteer of Streams shows that the Lehigh River begins as the outflow of Pocono Peak Lake. Flowing south from the south end of the lake it turns west after a mile and receives water from many lakes and ponds as it flows past the borough of Gouldsboro.
Fishing
The Lehigh River holds many species of fish, such as trout, smallmouth bass, largemouth bass, pickerel, panfish, carp, catfish and muskellunge. Trout, both rainbow and brown in the 18"-20" range are average while some have been caught into the mid to upper 20" range. Smallmouth bass are large in numbers but are of smaller size with most between 8"-14" with an occasional fish from the 18"-21" range. There is an increasing number of muskie being reported within the 30"-52" range. There are both pure and tiger muskie, the usually sterile, hybrid offspring of the true muskellunge and the northern pike being caught in the river. Over the years since 2005 various groups such as the and the Pennsylvania Fish & Boat Commission have worked with the Army Corps of Engineers to design annual flow plans from the Frances Walter Dam to maximize the cold water discharge through the spring and summer. This has helped enhance the population of coldwater species namely Brown Trout, to gain a growing naturally reproducing population within the river below F.E.W. dam all the way to Northampton PA. Currently as of Nov 2019 the following agencies or groups stock the river with trout.
- Stocking F.E.W. to Sandy Run Creek, and Glenn Onoko to Jim thorpe
- Private Stocking Club - Stocking Glenn Onoko to Northamption
The Five Mile Club - Private stocking club - Stocking Bear Creek to Glen Onoko
The Lehigh River is a white water river with Class I, II, and III rapids. The most popular section of the Lehigh River for white water rafting, kayaking, and canoeing is through the Lehigh Gorge State Park. The Lehigh Gorge State Park begins at the Francis E. Walter Dam and ends in the town of Jim Thorpe, PA. Several white water outfitters operate guided white water rafting trips in various sections of the river. The first rafting outfitter on the Lehigh River was Whitewater Challengers, which was founded in 1975. Water releases from the Francis E. Walter Dam provide enough water to make the river deep enough for boating. Three popular boating trips on the Lehigh River are: