Jasper County Lake Quality
Iowa, 3 lakes, measured by Iowa DNR
Jasper 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. 2 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. For Jasper County the spread behind the average matters more than the average itself: a few nutrient-rich lakes among many clear ones produce the same figure as the inverse.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Mariposa Lake.
Where to stay near Jasper County
Top-rated places to stay near Jasper County
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Jasper County?
Get lake water-quality updates plus the best cabin & lodging deals near Jasper County — straight to your inbox. No spam, unsubscribe anytime.
Quick Answers for Jasper County
Planning a trip? Check special fishing regulations for Mariposa Lake — or check the official Iowa fishing regulations.
All Lakes in Jasper County
3 lakes · 2 ranked on readings, 1 without enough sampling2 lakes ranked on readings · 1 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Mariposa LakeJasper | 5.1 ft | 31 µg/L | 8.9 µg/L | No recent samples | Not recorded |
| 2 | Rock Creek Max Depth LakeJasper | 1.1 ft | 167.5 µg/L | 107.5 µg/L | No recent samples | Not recorded |
| Rock Creek Beach LakeJasper | 1.1 ft | No recent samples | No recent samples | No recent samples | ✓ Public |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of lakes that fit, with the water quality behind each one.
Other Counties in Iowa
Browse every Iowa lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: the Iowa Department of Natural Resources. See data sources.