Well NA03901116AAA2 EW-20C (EW20C) Confined
Co-located Well(s): NA03901116AAA1 EW-20U (EW20U)

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Well Information Table
Common Well ID	NA03901116AAA2 EW-20C
USBR Well ID	EW20C
USGS Well ID	373802105455202
GSDNP Well Name	373802105455202
USGS Station Name	NA03901116AAA2 EW-20C
USGS Construction Date	10/23/1980
USGS Site Type	Well
USGS Site Use Information	Observation
USGS Groundwater Use Information	Unused
Data Source(s)	USGS, USBR
Location Data
TRS	NA03901116AAA2 EW-20C
USBR TRS	NA03901116AAA2
USGS TRS 1	NA03901116AAA2 EW-20C
Longitude/Latitude (NAD83)	-105.76497632 , 37.63419643
Longitude/Latitude Data Source	USBOR EW well locations
USGS Longitude/Latitude (NAD83)	-105.7650189 , 37.63389090
USBR Longitude/Latitude (NAD27)	-105.764401886567 , 37.6341944004732
Easting, Northing RGDSS-NAD83 (US ft)	173689.47 , 232373.55
USGS Topography	Valley flat
USGS County	Alamosa County
USGS Map Name	HOOPER EAST
USGS Map Scale	24000
Elevation and Depth Data
Ground Elevation (ft NAVD88)	7525.97
Elevation Data Source	USBOR EW well database
USBR Ground Elevation (ft NGVD29)	7522.0
USGS Ground Elevation (ft NGVD29)	7522.20
1/3-Arc Second NED Ground Elevation (ft NAVD88)	7526.80
1-Arc Second NED Ground Elevation (ft NAVD88)	7525.76
SRTM Ground Elevation (ft NAVD88)	7533.16
Total Depth (ft)	128.00
USBR Total Depth (ft)	128
USGS Hole Depth (ft)	128.00
USGS Well Depth (ft)	128.00
Model Layer	2
Model Layer Source	Well Depth
Depth of Bottom of Layer 1	83
Depth of Bottom of Layer 2	400
Depth of Bottom of Layer 3	1255
Depth of Bottom of Layer 4	2538
Additional Well Information	Logs, Construction
Aquifer Information
Aquifer Type	Confined
Aquifer Type Source	EW_AQFR
USGS Hydrologic Unit	San Luis
USGS Data Available	Water-level (GW.LEV)
Water-level Database Information
Water-level Count	314
Water-level Date Range	10/14/1980 thru 07/15/2024
Monitored within the last 18 months	Yes, most recently on 07/15/2024
Depth-to-Water Range (ft)	3.34 to 7.06
Water Table Elevation Range (ft NAVD88)	7518.91 to 7522.63
Water-Level-Source:Number-of-Measurements	USGS:60 USBR:285

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Water-level Data

2019 to Present

1967 to Present

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Measurement Date	Depth to Water (ft)	Elevation (ft NAVD88)	Data Source(s)
10/14/1980	4.43	7521.54	USBR
10/29/1980	4.63	7521.34	USBR
11/13/1980	4.31	7521.66	USBR
11/28/1980	4.46	7521.51	USBR
12/10/1980	4.46	7521.51	USBR
01/19/1981	4.34	7521.63	USBR
02/03/1981	4.57	7521.40	USBR
02/24/1981	4.38	7521.59	USBR
03/25/1981	4.48	7521.49	USBR
04/23/1981	4.80	7521.17	USBR
06/01/1981	4.80	7521.17	USBR
06/19/1981	4.90	7521.07	USBR
07/15/1981	4.90	7521.07	USBR
08/18/1981	4.90	7521.07	USBR
09/23/1981	4.86	7521.11	USGS
09/25/1981	4.80	7521.17	USBR
10/15/1981	4.80	7521.17	USBR
12/21/1981	4.60	7521.37	USBR
02/01/1982	4.80	7521.17	USBR
03/10/1982	4.90	7521.07	USBR
04/22/1982	5.10	7520.87	USBR
05/25/1982	4.90	7521.07	USBR
06/29/1982	5.10	7520.87	USBR
07/22/1982	5.22	7520.75	USBR
08/26/1982	5.15	7520.82	USBR
09/28/1982	4.92	7521.05	USBR
10/30/1982	5.16	7520.81	USBR
11/23/1982	5.13	7520.84	USBR
12/21/1982	5.13	7520.84	USBR
01/19/1983	4.88	7521.09	USBR
02/16/1983	4.64	7521.33	USBR
03/21/1983	4.87	7521.10	USBR
04/21/1983	4.84	7521.13	USBR
05/17/1983	4.90	7521.07	USBR
06/16/1983	5.13	7520.84	USBR
07/18/1983	5.11	7520.86	USBR
08/16/1983	5.09	7520.88	USBR
09/15/1983	4.97	7521.00	USBR
10/17/1983	5.02	7520.95	USBR
11/16/1983	5.05	7520.92	USBR
12/13/1983	4.76	7521.21	USBR
01/17/1984	4.71	7521.26	USBR
02/15/1984	4.66	7521.31	USBR
03/14/1984	4.82	7521.15	USBR
04/16/1984	5.12	7520.85	USBR
05/15/1984	5.02	7520.95	USBR
06/18/1984	4.99	7520.98	USBR
07/10/1984	4.91	7521.06	USBR
08/14/1984	4.80	7521.17	USBR
09/19/1984	4.80	7521.17	USBR
11/14/1984	4.73	7521.24	USGS,USBR
01/05/1985	4.83	7521.14	USBR
02/15/1985	4.83	7521.14	USGS
02/28/1985	4.83	7521.14	USGS,USBR
03/26/1985	4.81	7521.16	USGS,USBR
04/24/1985	4.76	7521.21	USGS,USBR
05/30/1985	4.72	7521.25	USGS,USBR
07/02/1985	4.91	7521.06	USGS,USBR
08/08/1985	4.56	7521.41	USGS,USBR
09/04/1985	4.43	7521.54	USGS,USBR
10/17/1985	4.52	7521.45	USGS,USBR
11/20/1985	4.27	7521.70	USGS,USBR
12/17/1985	4.37	7521.60	USGS,USBR
01/21/1986	4.05	7521.92	USGS,USBR
02/19/1986	4.00	7521.97	USGS,USBR
03/17/1986	3.66	7522.31	USGS,USBR
04/25/1986	3.93	7522.04	USGS,USBR
05/22/1986	3.92	7522.05	USGS,USBR
06/17/1986	4.06	7521.91	USGS,USBR
07/21/1986	3.83	7522.14	USGS,USBR
08/19/1986	3.78	7522.19	USGS,USBR
10/07/1986	3.63	7522.34	USGS,USBR
11/05/1986	3.62	7522.35	USGS
11/15/1986	3.62	7522.35	USBR
12/02/1986	3.52	7522.45	USGS
12/15/1986	3.52	7522.45	USBR
01/14/1987	3.43	7522.54	USGS
01/15/1987	3.43	7522.54	USBR
02/05/1987	3.70	7522.27	USGS
02/15/1987	3.70	7522.27	USBR
03/11/1987	3.58	7522.39	USGS
03/15/1987	3.58	7522.39	USBR
04/15/1987	3.70	7522.27	USGS,USBR
05/15/1987	3.37	7522.60	USBR
05/27/1987	3.37	7522.60	USGS
06/15/1987	3.46	7522.51	USBR
06/23/1987	3.46	7522.51	USGS
07/14/1987	3.36	7522.61	USGS
07/15/1987	3.36	7522.61	USBR
08/18/1987	3.34	7522.63	USGS,USBR
05/25/1988	3.59	7522.38	USBR
06/15/1988	3.69	7522.28	USBR
07/15/1988	3.58	7522.39	USBR
08/15/1988	3.63	7522.34	USBR
10/20/1988	3.69	7522.28	USBR
12/15/1988	3.71	7522.26	USBR
02/15/1989	3.88	7522.09	USBR
03/15/1989	3.79	7522.18	USBR
04/15/1989	3.84	7522.13	USBR
04/25/1989	3.77	7522.20	USBR
05/15/1989	3.75	7522.22	USBR
06/15/1989	3.98	7521.99	USBR
07/15/1989	4.03	7521.94	USBR
08/15/1989	4.01	7521.96	USBR
09/15/1989	4.08	7521.89	USBR
10/15/1989	3.92	7522.05	USBR
11/15/1989	4.13	7521.84	USBR
12/15/1989	3.99	7521.98	USBR
01/15/1990	4.08	7521.89	USBR
02/15/1990	3.82	7522.15	USBR
03/15/1990	4.06	7521.91	USBR
04/15/1990	4.25	7521.72	USBR
05/15/1990	4.07	7521.90	USBR
06/15/1990	4.16	7521.81	USBR
07/15/1990	4.18	7521.79	USBR
08/15/1990	4.21	7521.76	USBR
09/15/1990	4.18	7521.79	USBR
10/15/1990	4.13	7521.84	USBR
11/15/1990	4.31	7521.66	USBR
12/15/1990	4.16	7521.81	USBR
01/15/1991	4.02	7521.95	USBR
02/15/1991	4.17	7521.80	USBR
03/15/1991	3.92	7522.05	USBR
04/15/1991	4.10	7521.87	USBR
05/15/1991	4.01	7521.96	USBR
06/15/1991	4.22	7521.75	USBR
07/15/1991	4.15	7521.82	USBR
08/15/1991	4.15	7521.82	USBR
09/15/1991	4.09	7521.88	USBR
10/10/1991	4.37	7521.60	USBR
11/15/1991	4.08	7521.89	USBR
12/15/1991	4.44	7521.53	USBR
01/15/1992	4.32	7521.65	USBR
02/15/1992	4.17	7521.80	USBR
03/15/1992	4.28	7521.69	USBR
04/15/1992	4.18	7521.79	USBR
05/15/1992	4.03	7521.94	USBR
07/15/1992	3.91	7522.06	USBR
08/15/1992	4.05	7521.92	USBR
09/15/1992	3.93	7522.04	USBR
10/15/1992	3.84	7522.13	USBR
11/15/1992	4.01	7521.96	USBR
12/15/1992	3.66	7522.31	USBR
01/15/1993	3.92	7522.05	USBR
02/15/1993	3.63	7522.34	USBR
03/15/1993	3.84	7522.13	USBR
04/15/1993	3.95	7522.02	USBR
05/15/1993	4.12	7521.85	USBR
06/15/1993	3.97	7522.00	USBR
07/15/1993	3.80	7522.17	USBR
08/15/1993	3.82	7522.15	USBR
09/15/1993	3.75	7522.22	USBR
10/15/1993	3.61	7522.36	USBR
11/15/1993	3.68	7522.29	USBR
12/15/1993	3.43	7522.54	USBR
01/15/1994	3.70	7522.27	USBR
02/15/1994	3.84	7522.13	USBR
03/15/1994	3.79	7522.18	USBR
04/15/1994	3.84	7522.13	USBR
05/15/1994	3.78	7522.19	USBR
06/15/1994	3.71	7522.26	USBR
07/15/1994	3.87	7522.10	USBR
08/15/1994	3.87	7522.10	USBR
09/15/1994	3.89	7522.08	USBR
10/26/1994	3.86	7522.11	USBR
10/26/1994	3.83	7522.14	USGS
11/15/1994	3.99	7521.98	USBR
12/01/1994	3.90	7522.07	USGS
12/01/1994	3.93	7522.04	USBR
12/15/1994	3.88	7522.09	USBR
01/15/1995	3.73	7522.24	USBR
02/15/1995	3.76	7522.21	USBR
03/07/1995	3.99	7521.98	USGS
03/07/1995	4.02	7521.95	USBR
04/15/1995	3.76	7522.21	USBR
05/22/1995	3.91	7522.06	USGS
05/22/1995	3.94	7522.03	USBR
06/15/1995	3.98	7521.99	USBR
07/15/1995	3.89	7522.08	USBR
08/15/1995	3.62	7522.35	USBR
08/30/1995	3.65	7522.32	USGS
08/30/1995	3.68	7522.29	USBR
11/30/1995	3.56	7522.41	USGS
11/30/1995	3.59	7522.38	USBR
03/20/1996	3.68	7522.29	USGS
03/20/1996	3.71	7522.26	USBR
05/30/1996	3.55	7522.42	USGS
05/30/1996	3.58	7522.39	USBR
07/11/1996	3.85	7522.12	USBR
07/31/1996	3.90	7522.07	USBR
08/29/1996	3.91	7522.06	USGS
08/29/1996	3.94	7522.03	USBR
11/06/1996	3.74	7522.23	USBR
01/15/1997	3.95	7522.02	USBR
03/07/1997	4.05	7521.92	USGS
03/07/1997	4.08	7521.89	USBR
04/22/1997	3.98	7521.99	USBR
04/29/1997	3.82	7522.15	USBR
05/28/1997	4.13	7521.84	USBR
06/18/1997	4.05	7521.92	USBR
08/14/1997	4.07	7521.90	USBR
08/28/1997	4.09	7521.88	USGS
08/28/1997	4.12	7521.85	USBR
11/24/1997	4.17	7521.80	USBR
12/05/1997	4.13	7521.84	USBR
12/05/1997	4.10	7521.87	USGS
01/15/1998	4.13	7521.84	USBR
03/12/1998	4.23	7521.74	USGS
03/12/1998	4.26	7521.71	USBR
04/15/1998	3.96	7522.01	USBR
06/03/1998	4.15	7521.82	USGS
06/03/1998	4.18	7521.79	USBR
06/23/1998	4.28	7521.69	USBR
09/02/1998	4.26	7521.71	USBR
09/02/1998	4.23	7521.74	USGS
09/29/1998	4.25	7521.72	USBR
10/13/1998	4.34	7521.63	USBR
12/09/1998	4.25	7521.72	USGS,USBR
01/15/1999	4.18	7521.79	USBR
02/08/1999	4.24	7521.73	USBR
02/15/1999	4.17	7521.80	USBR
03/15/1999	4.22	7521.75	USBR
04/15/1999	4.27	7521.70	USBR
05/19/1999	4.21	7521.76	USBR
06/03/1999	4.25	7521.72	USGS,USBR
06/15/1999	4.24	7521.73	USBR
07/15/1999	4.02	7521.95	USBR
08/15/1999	4.01	7521.96	USBR
09/15/1999	3.84	7522.13	USBR
10/15/1999	3.63	7522.34	USBR
11/15/1999	3.87	7522.10	USBR
12/15/1999	3.79	7522.18	USBR
01/05/2000	3.68	7522.29	USGS,USBR
01/24/2000	3.78	7522.19	USBR
04/26/2000	3.91	7522.06	USBR
06/21/2000	3.83	7522.14	USGS,USBR
07/25/2000	3.89	7522.08	USBR
10/26/2000	3.91	7522.06	USBR
01/05/2001	4.25	7521.72	USBR
01/10/2001	3.95	7522.02	USGS
01/10/2001	3.96	7522.01	USBR
01/12/2001	3.82	7522.15	USBR
03/28/2001	3.91	7522.06	USBR
05/10/2001	4.15	7521.82	USBR
06/25/2001	4.14	7521.83	USGS,USBR
08/20/2001	4.13	7521.84	USBR
11/07/2001	4.23	7521.74	USBR
01/16/2002	4.00	7521.97	USGS,USBR
02/21/2002	4.39	7521.58	USBR
04/24/2002	4.28	7521.69	USBR
07/11/2002	4.37	7521.60	USBR
08/01/2002	4.34	7521.63	USGS,USBR
08/16/2002	4.37	7521.60	USBR
11/06/2002	4.55	7521.42	USBR
02/21/2003	4.26	7521.71	USGS,USBR
03/26/2003	4.35	7521.62	USBR
06/12/2003	4.37	7521.60	USBR
08/07/2003	4.63	7521.34	USGS,USBR
10/17/2003	4.79	7521.18	USBR
01/09/2004	4.82	7521.15	USBR
02/25/2004	4.66	7521.31	USBR
04/16/2004	4.67	7521.30	USBR
06/10/2004	4.53	7521.44	USBR
08/18/2004	4.69	7521.28	USGS
09/20/2004	4.63	7521.34	USBR
11/16/2004	4.82	7521.15	USBR
01/06/2005	4.58	7521.39	USBR
03/08/2005	4.75	7521.22	USGS
03/22/2005	4.77	7521.20	USBR
06/16/2005	4.87	7521.10	USBR
08/25/2005	5.00	7520.97	USGS
09/20/2005	5.08	7520.89	USBR
11/29/2005	4.85	7521.12	USBR
01/05/2006	5.25	7520.72	USBR
03/23/2006	5.16	7520.81	USBR
05/24/2006	5.17	7520.80	USBR
09/06/2006	5.14	7520.83	USBR
01/09/2007	5.17	7520.80	USBR
08/08/2007	5.08	7520.89	USBR
09/06/2007	5.15	7520.82	USBR
01/15/2008	5.03	7520.94	USBR
09/22/2008	5.18	7520.79	USBR
01/05/2009	5.06	7520.91	USBR
09/24/2009	5.32	7520.65	USBR
01/04/2010	5.39	7520.58	USBR
09/23/2010	5.33	7520.64	USBR
12/28/2010	5.35	7520.62	USBR
09/26/2011	5.55	7520.42	USBR
01/11/2012	5.41	7520.56	USBR
06/11/2012	5.74	7520.23	USBR
09/21/2012	5.76	7520.21	USBR
01/09/2013	5.84	7520.13	USBR
06/13/2013	5.83	7520.14	USBR
01/14/2014	5.95	7520.02	USBR
01/06/2015	6.21	7519.76	USBR
01/04/2016	6.17	7519.80	USBR
04/26/2016	6.17	7519.80	USBR
12/15/2016	6.07	7519.90	USBR
10/03/2017	6.25	7519.72	USBR
01/03/2018	6.40	7519.57	USBR
09/28/2018	6.40	7519.57	USBR
01/16/2019	6.51	7519.46	USBR
08/08/2019	6.51	7519.46	USBR
12/19/2019	6.45	7519.52	USBR
10/02/2020	6.66	7519.31	USBR
01/12/2021	6.68	7519.29	USBR
09/20/2021	6.59	7519.38	USBR
01/19/2022	6.61	7519.36	USBR
08/08/2022	6.90	7519.07	USBR
12/05/2022	6.63	7519.34	USBR
09/26/2023	6.95	7519.02	USBR
01/18/2024	6.78	7519.19	USBR
04/11/2024	6.93	7519.04	USBR
07/15/2024	7.06	7518.91	USBR

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Well NA03901116AAA2 EW-20C (EW20C)Confined

View Digital Orthophoto Quadrangle for this area

Water-level Data

2019 to Present

1967 to Present

Well NA03901116AAA2 EW-20C (EW20C)
Confined