A long-term project to map and catalog all precontact Native American burial mounds in Iowa provides information about the number, location, form, survivorship, and rate of loss of mounds. This analysis reveals previously undocumented mound manifestations, including a large cluster of 200 linear mounds along the central Des Moines River valley. Historical records reveal that at least 7,762 mounds were identified at 1,551 sites in Iowa between 1840 and the present. About 47% of the mounds from these sites can be possibly seen in lidar, with 33% of the total clearly seen in lidar. Data show that mound loss over time is linear. Extrapolation of data suggests that at least 15,000–17,000 mounds stood in Iowa in the nineteenth century, but the actual number was likely higher.

一个长期项目对爱荷华州所有接触前的美洲原住民墓葬进行了地图和编录，提供了有关墓葬数量、位置、形式、幸存率和损失率的信息。这项分析揭示了以前未记录的土丘表现，包括沿得梅因河谷中部的一大群 200 个线性土丘。历史记录显示，从 1840 年至今，爱荷华州 1,551 个地点至少发现了 7,762 个土墩。这些地点的土丘中约 47% 可以在激光雷达中看到，其中 33% 可以在激光雷达中清晰可见。数据显示，土堆损失随时间的推移呈线性关系。数据推断表明，19 世纪爱荷华州至少有 15,000-17,000 个土墩，但实际数量可能更高。