I once dug a 12 lb shot from a backyard near here. I took it to the local, very historical, Sutter's Fort and it fit their small gun perfectly. The ball was found 7 blocks from the fort, a perfect distance for the cannon shot. The fort was in total ruins by 1870, with most of the usable material carried away by 49ers during the Gold Rush. Eventually, the fort was reconstructed beginning in the late 1890s and is a landmark in CA history. The story of Sutter and New Helvetia is a fascinating one.