The Denny Regrade wasn't the only radical reshaping of Seattle's topography in this period. The slightly earlier Jackson Regrade had already reshaped Pioneer Square and the International District. The 1911–1917 construction of the Lake Washington Ship Canal included two major "cuts" (the Montlake Cut and the Fremont Cut), four bascule bridges, and the Government Locks (now Hiram M. Chittenden Locks). The level of Lake Washington dropped; the Black River, which formerly ran out of the south end of the lake, dried up completely, and Seward Island became the Seward Peninsula, now the site of Seward Park.(2) Lange (25 August 2000, Essay 2624)</ref>