Little Jackson (Highlands County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 27°28'2", Longitude 81°27'46"

Period of record: 62 sampling dates; October 13, 1991 to December 31, 1999

Surface area (LAKEWATCH): 137 acres / 55 hectacres     Bathymetric  Map

Lake Region (Griffith et al. 1997): Southern Lake Wales Ridge

Geologic formation (Brooks 1981):

The geology is dominated by deeply weathered beach and dune sand with some clay lenses of the preglacial Pleistocene.

Physiographic region (Brooks 1981):

The water body lies in the Eastern Complex of the Central Ridge subdivision of the Lake Wales Ridge division of the Central Lake District.

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 2 months sampled:
 
pH
7.2
 Sulfate (mg/L)
18.7
Total alkalinity (mg/L as CaCO3)
14.5
 Calcium (mg/L)
10.0
Conductance (µS/cm @ 25 °C)
147
 Magnesium (mg/L)
3.1
Color (Pt-Co units)
28
 Sodium (mg/L)
8.6
Chloride (mg/L)
17.8
 Potassium (mg/L)
4.3
Silicon (mg/L)
0.7
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 62 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
23
52
110
Long-term total nitrogen concentrations (µg/L)
620
970
2240
Long-term total chlorophyll concentrations (µg/L)
11.7
39.0
174.7
Long-term Secchi depth (ft)
1.0
3.5
5.6

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
41
790
40.0
3.0
Feb-27-99
45
850
42.0
3.0
Mar-27-99
51
1120
50.3
2.0
Apr-30-99
51
890
41.3
3.0
May-31-99
37
910
32.3
2.5
Jul-24-99
59
980
57.3
3.0
Aug-22-99
49
1180
64.0
3.0
Sep-25-99
43
850
43.7
3.0
Oct-09-99
46
820
31.0
3.8
Nov-11-99
77
930
49.3
4.0
Dec-31-99
102
1340
106.7
1.5
         
1999 Average
54
970
50.7
2.9

Little Jackson (Highlands County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on August 6, 1996

Percent area covered with aquatic vegetation (PAC, %)
11
Percent of lake's volume filled with vegetation (PVI, %)
2
Average emergent plant biomass (kg wet wt/m2)
4.3
Average floating-leaved plant biomass (kg wet wt/m2)
1.4
Average submersed plant biomass (kg wet wt/m2)
0.1
Average width of emergent and floating-leaved zone (ft.)
68
Average lake depth (m)
4

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
cat-tail Typha spp.
80
water spinach Ipomoea aquatica
40
Brazilian pepper Schinus terebinthifolius
40
melaleuca Melaleuca quinquenervia
40
water primrose Ludwigia octovalvis
40
water-pennywort Hydrocotyle umbellata
30
willow Salix spp.
30
torpedograss Panicum repens
30
pickerelweed Pontederia cordata
20
coontail Ceratophyllum demersum
20
hydrilla Hydrilla verticillata
20
wax myrtle Myrica cerifera
20
flat-sedge Cyperus odoratus
20
bald cypress Taxodium distichum
20
common duckweed Lemna minor
10
floating water-hyacinth Eichhornia crassipes
10
common salvinia Salvinia rotundifolia
10
alligator-weed Alternanthera philoxeroides
10
slender spikerush Eleocharis baldwinii
10
smartweed Polygonum hydropiperoides
10
southern naiad Najas guadalupensis
10
rush fuirena Fuirena scirpoidea
10
Baldwin flat sedge Cyperus globulosus
10
. Juncus megacephalus
10

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