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
JAN-MAR 2024	555 ug/l		410 ug/l		1	1
OCT-DEC 2023	929 ug/l		389 ug/l		3	4
JUL-SEP 2023	952 ug/l		356 ug/l		25	55
APR-JUN 2023	1,012 ug/l		300 ug/l		25	63
JAN-MAR 2023	785 ug/l		269 ug/l		24	63
OCT-DEC 2022	953 ug/l		286 ug/l		29	67
JUL-SEP 2022	1,081 ug/l		376 ug/l		3	5
APR-JUN 2022	870 ug/l		341 ug/l		22	48
JAN-MAR 2022	741 ug/l		261 ug/l		20	54
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): FDEP Historic Data from Legacy STORET, Lower watershed program (LWP), 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), USGS National Water Information System, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Manatee County Environmental Management Sampling Data, Enviro-Audit, 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
JUL-SEP 2023	1,102 ug/l		291 ug/l		2	5
APR-JUN 2023	824 ug/l		185 ug/l		2	6
JAN-MAR 2023	1,021 ug/l		173 ug/l		2	6
OCT-DEC 2022	1,027 ug/l		263 ug/l		2	6
APR-JUN 2022	783 ug/l		178 ug/l		2	6
JAN-MAR 2022	792 ug/l		180 ug/l		2	6
Five Year Seasonal Graph	Graph	Graph	Graph	Graph
Five Year Graph of All Samples	Graph	Graph	Graph	Graph

Source(s): Lower watershed program (LWP), FDEP Watershed Monitoring Section, Manatee County Environmental Management Sampling Data, USGS National Water Information System, FDEP Watershed Monitoring Section, Florida LAKEWATCH, Manatee County Environmental Management Sampling Data, FDEP - Watershed Assessment Section

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
Braden River	In the past 30 days Average river flow is slower 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
Gamble Creek	In the past 30 days Average river flow is slower 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
Upper Manatee River	In the past 30 days Average river flow is slower 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

Source(s): Not Available

Source(s): Not Available