Lou, The trails I walk at McKeldin Area of Patapsco Valley SP begin by parking on the Howard County side of the Patapsco in Marriottsville next to the railroad. Then walk back up Marriottsville Road a couple hundred yards, crossing both bridges. Then walk downstream through the floodplain forest to the intersection with the North Branch where you go upstream. At any time take one of the trails to the left into the upland forest, eventually crossing through the developed area of the park and returning through the forest to complete a loop. There are many variations on this theme. So far, there have been almost no migrants, just local breeders that have not departed and resident birds. Most of the breeding warblers have departed. Bob Ringler