The following data are summarized as seasonal average values for lake and river sampling locations located within the watershed. While these data are useful to serve as a general picture of watershed health, these data must be viewed with caution because these samples have been taken from ecologically different water resources.

Rivers:

Samples from most rivers located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
JUL-SEP 2025	1,006 ug/l		230 ug/l		1	1
APR-JUN 2025	1,366 ug/l		404 ug/l		13	23
JAN-MAR 2025	1,133 ug/l		240 ug/l		14	36
OCT-DEC 2024	1,229 ug/l		354 ug/l	0.16 mg/l	30	61
JUL-SEP 2024	1,436 ug/l		407 ug/l	0.27 mg/l	29	65
APR-JUN 2024	982 ug/l		236 ug/l	0.11 mg/l	32	67
JAN-MAR 2024	1,142 ug/l		212 ug/l	0.11 mg/l	42	94
OCT-DEC 2023	1,062 ug/l		272 ug/l		23	54
JUL-SEP 2023	1,193 ug/l		369 ug/l		22	57
APR-JUN 2023	1,126 ug/l		299 ug/l		21	53
JAN-MAR 2023	1,031 ug/l		233 ug/l		21	53
Five Year Seasonal Graph	Graph		Graph	Graph
Five Year Graph of All Samples	Graph		Graph	Graph

Source(s): FDEP Historic Data from Legacy STORET, Sarasota County Historic Data from Legacy STORET, Sarasota County Coastal Creeks, Sarasota County Environmental Services Department Sampling Data, FDEP Charlotte Harbor Aquatic/Buffer Preserves Sampling Data, Lee County, FDEP South District Sampling Data, FDEP Watershed Monitoring Section, Manatee County Environmental Management Sampling Data, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), FDEP - Charlotte Harbor Aquatic Preserves, Charlotte County, FDEP - South Regional Operations Center, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Manatee County Environmental Management Sampling Data, City of North Port, Southwest Florida Water Management District, FDEP - Southwest Regional Operations Center, FDEP - Watershed Assessment Section

Lakes:

Samples from most lakes located in this watershed are averaged as part of these data summaries.

Season	Total Nitrogen	Nitrate (NO3)	Total Phosphorus	Orthophosphate	Number of Sample Stations	Number of Samples
APR-JUN 2025	2,204 ug/l		108 ug/l		2	3
JAN-MAR 2025	1,004 ug/l		88 ug/l		1	3
OCT-DEC 2024	1,486 ug/l		362 ug/l		4	6
JUL-SEP 2024	1,065 ug/l		385 ug/l		5	13
APR-JUN 2024	1,226 ug/l		211 ug/l		8	14
JAN-MAR 2024	971 ug/l		170 ug/l		6	15
OCT-DEC 2023	1,331 ug/l		300 ug/l		9	18
JUL-SEP 2023	1,482 ug/l		478 ug/l		9	17
APR-JUN 2023	1,185 ug/l		228 ug/l		9	19
JAN-MAR 2023	1,067 ug/l		207 ug/l		5	11
Five Year Seasonal Graph	Graph		Graph
Five Year Graph of All Samples	Graph		Graph

Source(s): LAKEWATCH Volunteer Water Quality Monitoring, FDEP Historic Data from Legacy STORET, Sarasota County Coastal Creeks, FDEP South District Sampling Data, FDEP Watershed Monitoring Section, SWFWMD Water Quality Sampling Data, FDEP Southwest Regional Operations Center, FDEP, Water Quality Standards and Special Projects (Florida), FDEP - South Regional Operations Center, Florida LAKEWATCH, Southwest Florida Water Management District

Southwest Florida Water Management District calculates the Aquifer Resource Indicator (ARI) for their three groundwater regions each month. The ARI was created to provide the public with a gauge of groundwater levels in their area, so they can develop an understanding of the severity and cycles of drought and recovery. The three regions include: North (Citrus, Hernando, Lake, Levy, Marion, and Sumter counties), Central (Hillsborough, Pasco, Pinellas, and Polk counties), and South (Charlotte, DeSoto, Hardee, Highlands, Manatee, and Sarasota counties). Learn More about the Aquifer Resource Indicator >>

To determine the ARI for a region, each well is compared weekly to its respective low-normal value and the difference is calculated. The weekly differences are reduced to a monthly value for all monitoring wells within a region, and the resulting ARI value represents how far water levels in the aquifer must rise or fall to reach their respective low-normal values.

Source: SWFWMD Hydrologic Data Section Data

River	Flows Whole River Range	Flows Data by Segment	Levels Whole River Range	Levels Data By Segment
Big Slough	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Deer Prairie Slough	In the past 30 days NO DATA Recent river flow data is unavailable.	No data table or graph available	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Howard Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Cocoplum Waterway	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are lower than they have been historically.	Levels Data Table and Graph
Myakka River	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Coker Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Long Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Maple Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days NO DATA Recent water level data is unavailable.	No data table or graph available
Ogleby Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days Average water levels are higher than they have been historically.	Levels Data Table and Graph
Taylor Creek	In the past 30 days Average river flow is faster than it has been historically.	Flows Data Table and Graph	In the past 30 days NO DATA Recent water level data is unavailable.	No data table or graph available

Source(s): Not Available

Source(s): Not Available