Crooked Lake

"Trophic" means "relating to nutrition." The Trophic State Index (TSI) takes into account chlorophyll, nitrogen, and phosphorus, which are nutrients required by plant life. The Florida Department of Environmental Protection (FDEP) uses this information to determine a rating for the waterbody. Learn more about the Trophic State Index »

Latest Value	Limiting Nutrient	Historic Range	Additional Information
43 (Good) 10/11/2012 Source: LAKEWATCH Volunteer Water Quality Monitoring	PHOSPHORUS	16 (Good) - 56 (Good) 7/27/1984 - 10/11/2012 848 samples	10 Year Graph Seasonal Variation Graph Download this data
Legend: Water Quality Trophic State Index Trophic State Classification GOOD 0 - 59 Oligotrophic through Mid-Eutrophic FAIR 60 - 69 Mid-Eutrophic through Eutrophic POOR 70 - 100 Hypereutrophic

Although present in all surface waters, nutrients are among the leading causes of degradation of Florida water resources. Learn more about nutrient chemistry »

Parameter	Latest Value	Historic Range	Additional Information
Total Nitrogen (TN)	584.0 ug/l 10/11/2012 Source: LAKEWATCH Volunteer Water Quality Monitoring	210.0 - 2,720.0 ug/L 8/24/1967 - 10/11/2012 1,000 samples	2 Year Graph 10 Year Graph Seasonal Variation Graph Download this data
Total Phosphorus (TP)	12.2 ug/L 10/11/2012 Source: LAKEWATCH Volunteer Water Quality Monitoring	0.0 - 588.0 ug/L 8/24/1967 - 10/11/2012 986 samples	2 Year Graph 10 Year Graph Seasonal Variation Graph Download this data
Chlorophyll a, uncorrected for pheophytin	12.0 ug/L 12/20/2012 Source: LAKEWATCH Volunteer Water Quality Monitoring	0.0 - 30.0 ug/L 7/27/1984 - 12/20/2012 959 samples	2 Year Graph 10 Year Graph Seasonal Variation Graph Download this data
Chlorophyll a, corrected for pheophytin	8.8 ug/L 8/14/2012 Source: Polk County NRD	0.0 - 15.2 ug/L 1/7/1999 - 8/14/2012 174 samples	2 Year Graph 10 Year Graph Seasonal Variation Graph Download this data

Water clarity or turbidity measures the degree to which light is blocked because the water is cloudy or contains suspended particles, such as algae. Water clarity is one indicator of a waterbody's ability to sustain plants and wildlife. Learn more about water clarity »

Parameter	Latest Value	Historic Range	Additional Information
Secchi Depth	5.5 ft 12/20/2012 Source: LAKEWATCH Volunteer Water Quality Monitoring	0.6 - 17.5 ft 8/24/1967 - 12/20/2012 959 samples	2 Year Graph Seasonal Variation Graph Download this data
Turbidity	2.7 NTU 8/14/2012 Source: Polk County NRD	0.6 NTU - 9.3 NTU 10/27/1978 - 8/14/2012 278 samples	2 Year Graph Seasonal Variation Graph Download this data
Light Attenuation	0.31 Alpha/M 5/10/1994 Source: Mote Marine Historic Data from Legacy STORET

The currently used bacterial indicators for recreational waters include total coliform, fecal coliform and enterococcus. Indicator organisms themselves are not necessarily pathogenic but their presence "indicates" or suggests recent contamination by human sewage or other waste which may result in human illness. Sources of contamination include storm water runoff, sewage overflows and feces from wild and domestic animals. Learn more about bacteria »

Parameter	Latest Value	Historic Range	Additional Information
Fecal Coliform	0 CFU/100ml 1/27/2000 Source: SWFWMD Water Quality Monitoring Program Data	0 - 0 CFU/100ml 1/27/2000 - 1/27/2000 1 samples	2 Year Trend Graph - Old/Insufficient Data Seasonal Variation Graph Download this data
Total Coliform	0 CFU/100ml 1/27/2000 Source: SWFWMD Water Quality Monitoring Program Data	0 - 0 CFU/100ml 1/27/2000 - 1/27/2000 1 samples	2 Year Trend Graph - Old/Insufficient Data Seasonal Variation Graph Download this data
Enterococcus

Dissolved Oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Learn more about dissolved oxygen »

The Impaired Waters Data is the most recent available data from FDEP, but it may not reflect the current FDEP impaired list. These data are updated when and as soon as they are made available from FDEP.

This waterbody is impaired according to the State of Florida's Impaired Waters Rule (IWR) Chapter 62-303 F.A.C. that governs the Total Maximum Daily Loads (TMDL) Program or according to the U.S. Environmental Protection Agency (EPA). Identification of Impaired Surface Waters (IWR) is a new scientific approach for guiding Florida Department of Environmental Protection process for identifying and prioritizing impaired surface waters in Florida. The rule evaluates whether waters meet their designated uses for a particular analyte, which include aquatic life use support, primary contact and recreation use support, fish and shellfish consumption use support, and drinking water use support. All water resources in this county are designated as Class III waters. Class III waters are considered recreational use waters, which means that the water should be fishable and swimmable. Class II waters are for shellfish propagation and harvesting. Class I waters are considered potable (drinkable) water supplies. As part of the terms of a court order related to the 1998 303(d) list of impaired waters, some waters are listed as impaired by EPA but not listed by the State of Florida. Learn more about impaired waters »

Pollutants

This waterbody has been associated with the following WBIDs deemed impaired by the Florida Department of Environmental Protection:

WBID	Basin	Impairment(s)
1663	CROOKED LAKE	MERCURY (IN FISH TISSUE)

Source(s): Florida Department of Environmental Protection

This waterbody has been associated with the following WBIDs deemed impaired by the Environmental Protection Agency's 303(d) list:

WBID	Basin	Impairment(s)	EPA Details
1663	CROOKED LAKE	MERCURY IN FISH TISSUE	View additional EPA information »

Source(s): US Environmental Protection Agency

• View map of WBID boundaries and verified impairments within the mapping interface

 

• About Florida's Numeric Nutrient Standards for Lakes and Rivers
• Chart showing Central District BMAP Status, Working Groups, and Core Stakeholders
• EPA Impaired Waters and Total Maximum Daily Loads Program
• Florida Impaired Waters Lists - Comprehensive listing of impaired water resources in Florida and their current status.
• Proposed Total Maximum Daily Load (TMDL) For Mercury In 102 Florida Waterbodies
• Role of Aquatic Invasive Species in State Listing of Impaired Waters & TMDL Program-7 Case Studies
• Thirty Mile Creek (WBID 1639) Nutrients and Dissolved Oxygen TMDL

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