Refuge Monthly TP

Monthly total phosphorus geometric mean concentrations for the Refuge compared to calculated long-term levels.

Refuge total phosphorus compliance tracking.
Month-Year	Geometric Mean TP Concentration (μg L⁻¹)	Long-Term Limit (μg L⁻¹)	Average Stage (Ft, NGVD29)	Number of Samples
Feb-2021	4.7	7.5	17.02	14
Jan-2021	4.6	7.2	17.28	14
Dec-2020	5.6	7.2	17.39	14
Nov-2020	5.3	7.2	17.54	14
Oct-2020	6.4	7.2	17.45	14
Sep-2020	7.8	7.2	17.19	14
Aug-2020	6.8	9.3	16.57	14
Jul-2020	6.2	11.6	16.15	12
Jun-2020	7.9	11.2	16.20	12
May-2020	6.5	14.0	15.79	6
Apr-2020	8.2	11.1	16.21	11
Mar-2020	5.2	8.9	16.66	14
Feb-2020	5.8	8.7	16.73	14
Jan-2020	4.8	8.7	16.73	14
Dec-2019	5.2	9.2	16.59	14
Nov-2019	5.6	8.6	16.75	14
Oct-2019	6.7	9.8	16.46	13
Sep-2019	7.1	9.2	16.61	14
Aug-2019	7.1	9.3	16.58	14
Jul-2019	7.3	10.5	16.33	14
Jun-2019	8.6	12.2	16.04	9
May-2019	10.4	11.5	16.16	10
Apr-2019	7.4	11.0	16.24	12
Mar-2019	6.3	9.0	16.64	14
Feb-2019	9.1	9.1	16.62	14
Jan-2019	6.1	11.4	16.18	10
Dec-2018	6.0	10.4	16.36	11
Nov-2018	7.9	9.8	16.47	12
Oct-2018	6.2	9.4	16.55	14
Sep-2018	6.0	9.0	16.64	14
Aug-2018	7.0	10.8	16.27	12
Jul-2018	7.5	10.1	16.41	13
Jun-2018	7.4	8.8	16.69	14
May-2018	6.3	11.5	16.15	9
Apr-2018	9.2	12.4	16.01	9
Mar-2018	6.0	9.9	16.45	14
Note:
Key to units: μg L⁻¹ - micrograms per liter; Ft NGVD29 - Elevation in feet relative to the National Geodetic Vertical Datum of 1929.
^* Highlighted row with bold and italitized text indicate when an excursion over the long-term limit has occured.
^† Average stage is calculated using stage elevations at stations 1-7, 1-8C and 1-9 for a given sampling date.

Water Quality Grab Samples

Individual monthly total phosphorus grab sample concentrations for monitoring locations within the Refuge.