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Site Name: D-20-21 26BCC1 [CHM-2S]
Date of Revision: 2/21/2025
Previous Vertical Datum: 3900' above NAVD88
New Vertical Datum: 3925.50 above NAVD88
Reason for Revision: New value represents much more accurate GPS survey methodology than the original map based method.
List of Affected Measurements:
Date Time (UTC) Original Water Level Elev (NAVD88) Revised Water Level Elev (NAVD88)
7/9/2021 21:50 3875.88 3901.38
12/15/2021 19:39 3878.78 3904.28
4/6/2022 19:19 3879.15 3904.65
6/28/2022 21:35 3876.69 3902.19
10/4/2022 18:15 3878.87 3904.37
1/31/2023 16:20 3879.19 3904.69
4/26/2023 14:18 3879.17 3904.67
5/11/2023 19:58 3879.10 3904.60
5/11/2023 21:01 3879.11 3904.61
6/23/2023 14:38 3878.07 3903.57
11/17/2023 15:03 3875.74 3901.24
2/14/2024 20:07 3877.80 3903.30
4/17/2024 19:45 3878.48 3903.98
7/10/2024 16:44 3876.12 3901.62
10/30/2024 20:08 3874.78 3900.28
Method of Adjustment: Values recalculated using conversion factor derived from the new vertical datum.
Effective Date for Revisions: 2/21/2025
Contact Information: David Pratt (dpratt@usgs.gov)
