Woodbury County Lake Quality
Iowa, 3 lakes, average grade C (Fair)
Woodbury County has 3 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. Every one of those lakes carries an A–F grade, so the county-level summary covers the full set rather than a monitored subset. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Little Sioux Park Lake (A) is the cleanest in the county.
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Quick Answers for Woodbury County
Planning a trip? Check special fishing regulations for Little Sioux Park Lake — or check the official Iowa fishing regulations.
All Lakes in Woodbury County
3 lakes3 graded lakes
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ALittle Sioux Park LakeWoodbury | A | 5.7 ft | 19 µg/L | 5.7 µg/L | No recent samples | Not recorded |
| 2 | DSnyder Bend LakeWoodbury | D | 2.1 ft | 90 µg/L | 27.3 µg/L | No recent samples | Not recorded |
| 3 | FBrowns LakeWoodbury | F | 0.7 ft | 217 µg/L | 61.6 µg/L | No recent samples | ✓ Public |
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Other Counties in Iowa
See how Woodbury County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.