South Dakota State Record Rainbow Trout: 19 lb 4 oz
The South Dakota state record rainbow trout weighed 19 lb 4 oz. It was caught in 1980 from Oahe Tailwaters by Tom Moore, and the South Dakota Game, Fish and Parks still recognizes it as the state mark 46 years later.
Where the record came from
The record came from Oahe Tailwaters. We don't carry a water-quality grade for it: our index covers standing lakes with enough EPA Water Quality Portal samples to score, which leaves out rivers and tributaries, Great Lakes water, and smaller ponds that are rarely sampled. Browse the South Dakota lakes we do grade instead.
Rainbow Trout records by state
South Dakota ranks 8 of 12 among the states in our index for record rainbow trout. Illinois holds the heaviest at 31 lb 6 oz, set in 1993.
| # | State | Weight | Year | Water |
|---|---|---|---|---|
| 1 | Illinois | 31 lb 6 oz | 1993 | Lake Michigan |
| 2 | New York | 31 lb 3 oz | 2004 | Lake Ontario |
| 3 | Wisconsin | 27 lb 2 oz | 1997 | Lake Michigan |
| 4 | Michigan | 26 lb 8 oz | 1975 | Lake Michigan |
| 5 | Ohio | 21 lb 5 oz | 2010 | Lake Erie |
| 6 | North Dakota | 21 lb 4 oz | 1998 | Missouri River |
| 7 | Iowa | 19 lb 8 oz | 1984 | French Creek |
| 8 | South Dakota (this page) | 19 lb 4 oz | 1980 | Oahe Tailwaters |
| 9 | Indiana | 18 lb 8 oz | 1988 | Clear Lake |
| 10 | Missouri | 18 lb 1 oz | 2004 | Roaring River |
| 11 | Minnesota | 17 lb 6 oz | 1980 | Knife River |
| 12 | Pennsylvania | 15 lb 6 oz | 1986 | Jordan Creek |
Each figure comes from that state's own fisheries agency. Agencies differ on what they certify — some recognize catch-and-release length records alongside weight — so treat this as a comparison of standing certified weights, not a single national list.
How it ranks inside South Dakota
10 of South Dakota's 20 standing records are heavier than the 19 lb 4 oz rainbow trout — unsurprising, since record weight tracks species size more than anything about the water. 2 South Dakota records have stood longer, the rainbow trout mark dating to 1980.