Measurement values are offset by 2.9 ft between the RGWCD and USGS values between 11/08/1976 and 03/07/1977; and 0.15-ft on 05/02/1978 & 06/09/1978; based on the monthly measurement maps, the RGWCD values are correct. See below.
12/07/1976: DTW difference: RGWCD = 22.75; USGS = 19.85.
Documentation for RG03 (380601105505201) on 12/1976
02/05/1977: DTW difference: RGWCD = 22.00; USGS = 19.10 as listed i the USGS database.
Documentation for RG03 (380601105505201) on 02/1977
03/07/1977: DTW difference: RGWCD = 21.33; USGS = 18.43.
Documentation for RG03 (380601105505201) on 03/1977
04/26/1977: DTW difference: RGWCD = 20.30; USGS = 19.25.
Documentation for RG03 (380601105505201) on 04/1977
05/02/1978: DTW difference: RGWCD = 21.05; USGS = 20.90.
Documentation for RG03 (380601105505201) on 05/1978
06/09/1978: DTW difference: RGWCD = 20.95; USGS = 20.80.
Documentation for RG03 (380601105505201) on 06/1978
06/03/1983: DTW difference: RGWCD = 23.48; USGS = 22.48.
Documentation for RG03 (380601105505201) on 06/1983
03/06/1986: DTW difference: RGWCD = 18.46, USGS = 19.46.
Documentation for RG03 (380601105505201) on 03/1986
03/06/1989: DTW should be 14.89 not 14.81 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 03/1989
02/13/1996: DTW should be 14.90 not 14.89 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 02/1996
04/18/1996: DTW should be 15.02 not 15.01 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 04/1996
08/15/1996: DTW should be 17.34 not 17.33 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 08/1996
06/03/1998: DTW should be 18.75 not 18.76 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 06/1998
12/09/1999: DTW should be 20.14 not 20.15 as listed in the USGS database.
Documentation for RG03 (380601105505201) on 12/1999