Indawo yokwenza izinwele v Rock Island ube nesilinganiso esimaphakathi — 4.6 (ngokwezilinganiso zomsebenzisi Mapich).
Sithole indawo yokwenza izinwele Rock Island emigwaqweni elandelayo: 30th St, 18th Ave
Le datha ikhiqizwa kusetshenziswa izihlungi zangokwezifiso ezisuselwe kukho 2 Izinkampani, eyethulwe kuleli khasi.