| Froschgrundsee | |
| Coordinates: | 50.35°N 11.0283°W |
| Construction Began: | 1982 |
| Opening: | 1986 |
| Dam Height Thalweg: | 3407 m |
| Dam Height Foundation: | 18 m |
| Dam Length: | 350 m |
| Dam Width Crest: | 9 m |
| Neigung-Luft: | 1:20 |
| Neigung-Wasser: | 1:27--> |
| Dam Volume: | 420000 m3 |
| Dam Elevation Crest: | 359 m |
| Res Capacity Total: | 69 Mio. m3 |
| Res Capacity Active: | 66 Mio. m3 |
| Res Catchment: | 11084 km2 |
| Res Surface: | 94 ha |
| Res Elevation: | 3445 m |
| Hochwasser: | 97 m3/s --> |
Froschgrundsee, also known as Schönstädtspeicher, is a retention basin to protect the city of Coburg in Bavaria from the flooding of the Itz, Effelder, and the Grümpen. It lies in the municipality of Rödental in Upper Franconia. Froschgrundsee was completed in 1986 after four years of construction and cost 43 million DM in operations.[1]