History of Duck River Mussels
1970's
- Species richness and abundance declines
- Clean Water Act 1972
- Endangered Species Act 1973
- Normandy Dam Built
- TVA began monitoring 22 sites above Columbia, TN due to Columbia Dam in 1979
1980's
- Species richness remained stable, but mussel abundance increased in 1988
1990's-Early 2000's
-TVA Reservoir releases improvement initiative
- Normandy discharge regulation and improved dissolved oxygen
- Survey led by Steve Ahlstedt led to the finding of 54 species, 32 of which were below Centerville, TN
- Significant increase in species richness and abundance compared to 1979/1988; though there was a loss of 21 species since surveys began
- Reintroduction Plan finalized
2010's-2023
- Reintroductions introduced of several species in 2013
- Densities of most species stable since 2010, although there are some declines in 2020
- The Duck River reached historical drought in 2024 creating a drastic decrease in richness and abundance of mussel species