![](http://www.alamy.com/thumbs/6/4FA32F1A-AA94-436D-9F8E-8AC956BE8BB1/MT8531.jpg)
Large bags filled with rocks line the Lockhouse at Great Falls, MD, outside Washington DC, to prevent flood waters reaching the house.
Size: 6016px × 4016px
Location: Olsted Island, Great Falls, MD, USA
Photo credit: © Alan Kolnik / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: &, canal, danger, dc, falls, flood, great, house, island, lock, maryland, olmsted, pool, potomac, river, rocks, sunny, usa, washington