Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 29°31'7", Longitude 82°2'0"
Period of record: 120 sampling dates; March 1, 1989 to December 8, 1999
Surface area (LAKEWATCH): 47 acres / 19 hectacres Bathymetric Map
Lake Region (Griffith et al. 1997): Trail Ridge
Geologic formation (Brooks 1981):
The geology is dominated by deeply weathered clayey sand and granular sand of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the St. JohnÕs Offset 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Supplemental, unpublished water chemistry data, University of Florida.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 |
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Sulfate (mg/L) |
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| Total alkalinity (mg/L as CaCO3) |
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Calcium (mg/L) |
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| Conductance (µS/cm @ 25 °C) |
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Magnesium (mg/L) |
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| Color (Pt-Co units) |
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Sodium (mg/L) |
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| Chloride (mg/L) |
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Potassium (mg/L) |
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| Silicon (mg/L) |
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Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 120 months sampled:
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| Long-term total phosphorus concentrations (µg/L) |
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| Long-term total nitrogen concentrations (µg/L) |
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| Long-term total chlorophyll concentrations (µg/L) |
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| Long-term Secchi depth (ft) |
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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:
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Riley (Putnam County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on May 21, 1991
| Percent area covered with aquatic vegetation (PAC, %) |
14
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| Percent of lake's volume filled with vegetation (PVI, %) |
4
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| Average emergent plant biomass (kg wet wt/m2) |
5.8
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| Average floating-leaved plant biomass (kg wet wt/m2) |
3.4
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| Average submersed plant biomass (kg wet wt/m2) |
1.1
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| Average width of emergent and floating-leaved zone (ft.) |
34
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| Average lake depth (m) |
3
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Frequency that plant species occur in 10 evenly spaced transects around the lake.
| Common Name | Plant Species |
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| spatterdock | Nuphar luteum |
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| para grass | Brachiaria mutica |
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| southern cutgrass | Leersia hexandra |
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| red ludwigia | Ludwigia repens |
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| bladderwort | Utricularia foliosa |
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| pickerelweed | Pontederia cordata |
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| maidencane | Panicum hemitomon |
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| slender spikerush | Eleocharis baldwinii |
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| buttonbush | Cephalanthus occidentalis |
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| . | Cyperus elegans |
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| water-pennywort | Hydrocotyle umbellata |
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| purple bladderwort | Utricularia purpurea |
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| green algae | Chlorphyta |
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| club-rush | Eleocharis cellulosa |
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| water spider orchid | Habenaria repens |
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Riley (Putnam County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 18, 1998
| Percent area covered with aquatic vegetation (PAC, %) |
62
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| Percent of lake's volume filled with vegetation (PVI, %) |
22
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| Average emergent plant biomass (kg wet wt/m2) |
15.0
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| Average floating-leaved plant biomass (kg wet wt/m2) |
2.5
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| Average submersed plant biomass (kg wet wt/m2) |
1.4
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| Average width of emergent and floating-leaved zone (ft.) |
28
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| Average lake depth (m) |
3
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Frequency that plant species occur in 10 evenly spaced transects around the lake.
| Common Name | Plant Species |
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| variable-leaf milfoil | Myriophyllum heterophyllum |
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| maidencane | Panicum hemitomon |
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| red ludwigia | Ludwigia repens |
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| wax myrtle | Myrica cerifera |
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| pickerelweed | Pontederia cordata |
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| cone-spur bladderwort | Utricularia gibba |
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| para grass | Brachiaria mutica |
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| bladderwort | Utricularia foliosa |
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| purple bladderwort | Utricularia purpurea |
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| water primrose | Ludwigia octovalvis |
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| sweetbay | Magnolia virginiana |
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| buttonbush | Cephalanthus occidentalis |
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| sedge spp. | Cyperus spp. |
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| spatterdock | Nuphar luteum |
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| southern cutgrass | Leersia hexandra |
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| common duckweed | Lemna minor |
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| azolla | Azolla caroliniana |
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| slender spikerush | Eleocharis baldwinii |
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| bur marigold | Bidens mitis |
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| cat-tail | Typha spp. |
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| water-pennywort | Hydrocotyle umbellata |
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| bald cypress | Taxodium distichum |
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| Baldwin flat sedge | Cyperus globulosus |
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Riley (Putnam County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 28, 1999
| Percent area covered with aquatic vegetation (PAC, %) |
12
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| Percent of lake's volume filled with vegetation (PVI, %) |
4
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| Average emergent plant biomass (kg wet wt/m2) |
22.5
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| Average floating-leaved plant biomass (kg wet wt/m2) |
7.1
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| Average submersed plant biomass (kg wet wt/m2) |
0.3
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| Average width of emergent and floating-leaved zone (ft.) |
41
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| Average lake depth (m) |
3
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Frequency that plant species occur in 10 evenly spaced transects around the lake.
| Common Name | Plant Species |
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| sweetbay | Magnolia virginiana |
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| wax myrtle | Myrica cerifera |
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| buttonbush | Cephalanthus occidentalis |
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| para grass | Brachiaria mutica |
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| . | Scirpus cubensis |
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| spatterdock | Nuphar luteum |
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| water primrose | Ludwigia octovalvis |
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| pickerelweed | Pontederia cordata |
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| maidencane | Panicum hemitomon |
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| slender spikerush | Eleocharis baldwinii |
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| water tupelo | Nyssa aquatica |
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| cone-spur bladderwort | Utricularia gibba |
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| southern cutgrass | Leersia hexandra |
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| red ludwigia | Ludwigia repens |
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| variable-leaf milfoil | Myriophyllum heterophyllum |
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| fragrant water-lily | Nymphaea odorata |
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| cat-tail | Typha spp. |
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| green algae | Chlorphyta |
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| pipewort | Eriocaulon spp. |
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| red maple | Acer rubrum |
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