Crenshaw (Hillsborough County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°7'24", Longitude 82°29'46"
Period of record: 95 sampling dates; November 25, 1990 to November 28, 1999
Surface area : No data available.
Lake Region (Griffith et al. 1997): Land-O-Lakes
Geologic formation (Brooks 1981):
The geology is dominated by argillaceous to sandy impure limestone of the Tampa Formation.
Physiographic region (Brooks 1981):
The water body lies in the Land-O-Lakes subdivision of the Tampa Plain division of the Ocala Uplift District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 3 months sampled:
|
pH |
6.8 |
Sulfate (mg/L) |
7.2 |
|
Total alkalinity (mg/L as CaCO3) |
9.0 |
Calcium (mg/L) |
6.0 |
|
Conductance (µS/cm @ 25 °C) |
64 |
Magnesium (mg/L) |
1.0 |
|
Color (Pt-Co units) |
57 |
Sodium (mg/L) |
4.7 |
|
Chloride (mg/L) |
10.0 |
Potassium (mg/L) |
0.8 |
|
Silicon (mg/L) |
0.7 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 95 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
9 |
17 |
31 |
|
Long-term total nitrogen concentrations (µg/L) |
430 |
680 |
920 |
|
Long-term total chlorophyll concentrations (µg/L) |
3.0 |
9.0 |
39.3 |
|
Long-term Secchi depth (ft) |
3.0 |
6.1 |
10.0 |
1999 Florida LAKEWATCH Data
Numbers reported below are monthly averages calculated from 3 stations for total phosphorus (TP, µg/L), total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1999:
|
Date |
TP (µg/L) |
TN (µg/L) |
CHL (µg/L) |
SECCHI (ft |
|
Jan-30-99 |
12 |
550 |
4.0 |
8.0 |
|
Feb-27-99 |
15 |
590 |
3.7 |
8.0 |
|
Mar-28-99 |
12 |
470 |
5.7 |
7.7 |
|
May-31-99 |
16 |
560 |
5.3 |
7.0 |
|
Jun-27-99 |
14 |
480 |
4.0 |
8.8 |
|
Aug-29-99 |
12 |
560 |
4.3 |
8.2 |
|
Sep-28-99 |
19 |
670 |
7.3 |
6.0 |
|
Nov-28-99 |
12 |
560 |
3.7 |
10.0 |
|
|
|
|
|
|
|
1999 Average |
14 |
560 |
4.7 |
8.0 |
Crenshaw (Hillsborough County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on May 13, 1992
|
Percent area covered with aquatic vegetation (PAC, %) |
12 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
5 |
|
Average emergent plant biomass (kg wet wt/m2) |
1.4 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.1 |
|
Average submersed plant biomass (kg wet wt/m2) |
0.9 |
|
Average width of emergent and floating-leaved zone (ft.) |
19 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
maidencane |
Panicum hemitomon |
100 |
|
musk-grass |
Chara spp. |
90 |
|
slender spikerush |
Eleocharis baldwinii |
40 |
|
water primrose |
Ludwigia octovalvis |
40 |
|
torpedograss |
Panicum repens |
30 |
|
spatterdock |
Nuphar luteum |
10 |
|
pickerelweed |
Pontederia cordata |
10 |
|
water-pennywort |
Hydrocotyle umbellata |
10 |
|
buttonbush |
Cephalanthus occidentalis |
10 |
|
willow |
Salix spp. |
10 |
|
red root |
Lachnanthes caroliniana |
10 |