Geography of Sheffield (Totley Brook passes south of Totley and meets Old Hay Brook at Needham's Dyke). The Sheaf flows northwards to join the River Don near Blonk Street Bridge in the city centre. This lower section of the River Sheaf together with the River Don, between the present Blonk Street and Lady's Bridge, formed part of the perimeter of Sheffield Castle. Porter Brook's source is just inside the Peak District National Park, to the west of the city, at Clough Hollow, also near Ringinglow. From here it flows eastward to meet the Sheaf, at a point now located underneath Sheffield Midland Station.
Sheffield Avenue about 100 feet west of the CTA Red Line for nearly all of its length, and the Brown Line and Purple Line for much of it. Six CTA stations are on the parallel segment near Sheffield, and two more are within a quarter-mile of the street's ends. The avenue runs through the heart of the DePaul University campus and the Wrigleyville neighborhood. In Chicago's grid system, 1000 W south of the North Branch River is known as Morgan Street, which runs through the city limits. The length of North Sheffield Avenue is three miles. Sheffield Avenue Sheffield Avenue is a