| Items | Data | Remarks |
|---|---|---|
| Surface area | 220km2 | Nishiura172km2、Kitaura 36km2、Sotonasakaura 6km2、Hitachi-tonegawa 6km2 |
| Shoreline length | 251km | Nishiura 121.4km, Kitaura 74.5km, Hitachi-tonegawa 55.1km |
| Mean depth | 4m | |
| Maximum depth | 7m | |
| Water level T.P. | Y.P.+1.10m(April to Mid October) Y.P.+1.30m(Mid October to March) |
|
| Pondage | 0.85 billion m3 | |
| Annual mean precipitation | 1,278mm | |
| Catchment area | 2,157km2 | |
| Designation of Environmental Quality Standard Categories | Lake A |
Reference: Kasumigaura River Office, Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism (2009) Kasumigaura - Jigyo no Aramashi.