National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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WALKER RIVER - MASON AT SNYDER LANE (MASN2)
Latitude: 38.92º NLongitude: 119.19º WElevation: 4420 Feet
Location: Lyon County in NevadaBulletin Group: Eastern SierraRiver Group: Eastern Sierra
Issuance Time: Jul 13 2025 at 8:41 AM PDTNext Issuance: Jul 14 2025 at 9:00 AM PDT
Action/Monitor: 9.0 FeetMinor Flood: 9.8 FeetModerate Flood: 11.0 FeetMajor Flood: 11.6 Feet
Please Note:Significant losses can occur in the Mason Valley upstream of the Mason stream gage. Increased forecast uncertainty exists in the long range forecast due to these unknown losses.

# Tabular Observed and Forecast Hydrograph Information
#
# Location: Walker River - Mason at Snyder Lane (MASN2)
#
# File Generation Time:  07/13/2025 at 08:41 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  07/11/2025 at 04:00 PM PDT
# Maximum Observed Stage:                       4.24 Feet
# Maximum Observed Flow:                        161 cfs
#
# Earliest Date & Time of Maximum Forecast:     07/13/2025 at 09:00 AM PDT
# Maximum Forecast Stage:                       4.13 Feet
# Maximum Forecast Flow:                        140 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  07/08/2025 08 AM PDT            4.22            157                        Normal
  07/08/2025 09 AM PDT            4.22            157         0              Normal
  07/08/2025 10 AM PDT            4.22            157         0              Normal
  07/08/2025 11 AM PDT            4.22            157         0              Normal
  07/08/2025 12 PM PDT            4.21            155         -              Normal
  07/08/2025 01 PM PDT            4.21            155         0              Normal
  07/08/2025 02 PM PDT            4.22            157         +              Normal
  07/08/2025 03 PM PDT            4.22            157         0              Normal
  07/08/2025 04 PM PDT            4.22            157         0              Normal
  07/08/2025 05 PM PDT            4.21            155         -              Normal
  07/08/2025 06 PM PDT            4.20            153         -              Normal
  07/08/2025 07 PM PDT            4.20            153         0              Normal
  07/08/2025 08 PM PDT            4.19            151         -              Normal
  07/08/2025 09 PM PDT            4.18            149         -              Normal
  07/08/2025 10 PM PDT            4.18            149         0              Normal
  07/08/2025 11 PM PDT            4.18            149         0              Normal
  07/09/2025 12 AM PDT            4.17            148         -              Normal
  07/09/2025 01 AM PDT            4.17            148         0              Normal
  07/09/2025 02 AM PDT            4.17            148         0              Normal
  07/09/2025 03 AM PDT            4.17            148         0              Normal
  07/09/2025 04 AM PDT            4.17            148         0              Normal
  07/09/2025 05 AM PDT            4.16            146         -              Normal
  07/09/2025 06 AM PDT            4.16            146         0              Normal
  07/09/2025 07 AM PDT            4.16            146         0              Normal
  07/09/2025 08 AM PDT            4.16            146         0              Normal
  07/09/2025 09 AM PDT            4.17            148         +              Normal
  07/09/2025 10 AM PDT            4.18            149         +              Normal
  07/09/2025 11 AM PDT            4.18            149         0              Normal
  07/09/2025 12 PM PDT            4.19            151         +              Normal
  07/09/2025 01 PM PDT            4.20            153         +              Normal
  07/09/2025 02 PM PDT            4.20            153         0              Normal
  07/09/2025 03 PM PDT            4.21            155         +              Normal
  07/09/2025 04 PM PDT            4.20            153         -              Normal
  07/09/2025 05 PM PDT            4.20            153         0              Normal
  07/09/2025 06 PM PDT            4.19            151         -              Normal
  07/09/2025 07 PM PDT            4.19            151         0              Normal
  07/09/2025 08 PM PDT            4.19            151         0              Normal
  07/09/2025 09 PM PDT            4.19            151         0              Normal
  07/09/2025 10 PM PDT            4.19            151         0              Normal
  07/09/2025 11 PM PDT            4.19            151         0              Normal
  07/10/2025 12 AM PDT            4.19            151         0              Normal
  07/10/2025 01 AM PDT            4.19            151         0              Normal
  07/10/2025 02 AM PDT            4.19            151         0              Normal
  07/10/2025 03 AM PDT            4.19            151         0              Normal
  07/10/2025 04 AM PDT            4.19            151         0              Normal
  07/10/2025 05 AM PDT            4.19            151         0              Normal
  07/10/2025 06 AM PDT            4.19            151         0              Normal
  07/10/2025 07 AM PDT            4.18            149         -              Normal
  07/10/2025 08 AM PDT            4.18            149         0              Normal
  07/10/2025 09 AM PDT            4.18            149         0              Normal
  07/10/2025 10 AM PDT            4.17            148         -              Normal
  07/10/2025 11 AM PDT            4.19            151         +              Normal
  07/10/2025 12 PM PDT            4.20            153         +              Normal
  07/10/2025 01 PM PDT            4.20            153         0              Normal
  07/10/2025 02 PM PDT            4.20            153         0              Normal
  07/10/2025 03 PM PDT            4.20            153         0              Normal
  07/10/2025 04 PM PDT            4.19            151         -              Normal
  07/10/2025 05 PM PDT            4.19            151         0              Normal
  07/10/2025 06 PM PDT            4.18            149         -              Normal
  07/10/2025 07 PM PDT            4.18            149         0              Normal
  07/10/2025 08 PM PDT            4.18            149         0              Normal
  07/10/2025 09 PM PDT            4.18            149         0              Normal
  07/10/2025 10 PM PDT            4.18            149         0              Normal
  07/10/2025 11 PM PDT            4.18            149         0              Normal
  07/11/2025 12 AM PDT            4.18            149         0              Normal
  07/11/2025 01 AM PDT            4.18            149         0              Normal
  07/11/2025 02 AM PDT            4.18            149         0              Normal
  07/11/2025 03 AM PDT            4.18            149         0              Normal
  07/11/2025 04 AM PDT            4.18            149         0              Normal
  07/11/2025 05 AM PDT            4.18            149         0              Normal
  07/11/2025 06 AM PDT            4.17            148         -              Normal
  07/11/2025 07 AM PDT            4.17            148         0              Normal
  07/11/2025 08 AM PDT            4.18            149         +              Normal
  07/11/2025 09 AM PDT            4.18            149         0              Normal
  07/11/2025 10 AM PDT            4.18            149         0              Normal
  07/11/2025 11 AM PDT            4.19            151         +              Normal
  07/11/2025 12 PM PDT            4.20            153         +              Normal
  07/11/2025 01 PM PDT            4.24            161         +              Normal
  07/11/2025 02 PM PDT            4.24            161         0              Normal
  07/11/2025 03 PM PDT            4.24            161         0              Normal
  07/11/2025 04 PM PDT            4.24            161         0              Normal
  07/11/2025 05 PM PDT            4.22            157         -              Normal
  07/11/2025 06 PM PDT            4.22            157         0              Normal
  07/11/2025 07 PM PDT            4.23            159         +              Normal
  07/11/2025 08 PM PDT            4.23            159         0              Normal
  07/11/2025 09 PM PDT            4.23            159         0              Normal
  07/11/2025 10 PM PDT            4.23            159         0              Normal
  07/11/2025 11 PM PDT            4.23            159         0              Normal
  07/12/2025 12 AM PDT            4.22            157         -              Normal
  07/12/2025 01 AM PDT            4.22            157         0              Normal
  07/12/2025 02 AM PDT            4.22            157         0              Normal
  07/12/2025 03 AM PDT            4.22            157         0              Normal
  07/12/2025 04 AM PDT            4.22            157         0              Normal
  07/12/2025 05 AM PDT            4.22            157         0              Normal
  07/12/2025 06 AM PDT            4.22            157         0              Normal
  07/12/2025 07 AM PDT            4.21            155         -              Normal
  07/12/2025 08 AM PDT            4.21            155         0              Normal
  07/12/2025 09 AM PDT            4.20            153         -              Normal
  07/12/2025 10 AM PDT            4.20            153         0              Normal
  07/12/2025 11 AM PDT            4.19            151         -              Normal
  07/12/2025 12 PM PDT            4.18            149         -              Normal
  07/12/2025 01 PM PDT            4.17            148         -              Normal
  07/12/2025 02 PM PDT            4.17            148         0              Normal
  07/12/2025 03 PM PDT            4.17            148         0              Normal
  07/12/2025 04 PM PDT            4.17            148         0              Normal
  07/12/2025 05 PM PDT            4.16            146         -              Normal
  07/12/2025 06 PM PDT            4.17            148         +              Normal
  07/12/2025 07 PM PDT            4.19            151         +              Normal
  07/12/2025 08 PM PDT            4.20            153         +              Normal
  07/12/2025 09 PM PDT            4.20            153         0              Normal
  07/12/2025 10 PM PDT            4.19            151         -              Normal
  07/12/2025 11 PM PDT            4.19            151         0              Normal
  07/13/2025 12 AM PDT            4.19            151         0              Normal
  07/13/2025 01 AM PDT            4.18            149         -              Normal
  07/13/2025 02 AM PDT            4.18            149         0              Normal
  07/13/2025 03 AM PDT            4.18            149         0              Normal
  07/13/2025 04 AM PDT            4.17            148         -              Normal
  07/13/2025 05 AM PDT            4.17            148         0              Normal
  07/13/2025 06 AM PDT            4.16            146         -              Normal
  07/13/2025 07 AM PDT            4.15            144         -              Normal
  07/13/2025 08 AM PDT            4.14            142         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  07/13/2025 09 AM PDT            4.13            140                        Normal
  07/13/2025 10 AM PDT            4.13            140         0              Normal
  07/13/2025 11 AM PDT            4.12            138         -              Normal
  07/13/2025 12 PM PDT            4.12            138         0              Normal
  07/13/2025 01 PM PDT            4.11            137         -              Normal
  07/13/2025 02 PM PDT            4.11            137         0              Normal
  07/13/2025 03 PM PDT            4.11            137         0              Normal
  07/13/2025 04 PM PDT            4.10            135         -              Normal
  07/13/2025 05 PM PDT            4.10            135         0              Normal
  07/13/2025 06 PM PDT            4.09            133         -              Normal
  07/13/2025 07 PM PDT            4.09            133         0              Normal
  07/13/2025 08 PM PDT            4.09            133         0              Normal
  07/13/2025 09 PM PDT            4.08            131         -              Normal
  07/13/2025 10 PM PDT            4.08            131         0              Normal
  07/13/2025 11 PM PDT            4.08            131         0              Normal
  07/14/2025 12 AM PDT            4.08            131         0              Normal
  07/14/2025 01 AM PDT            4.08            131         0              Normal
  07/14/2025 02 AM PDT            4.08            131         0              Normal
  07/14/2025 03 AM PDT            4.08            131         0              Normal
  07/14/2025 04 AM PDT            4.08            131         0              Normal
  07/14/2025 05 AM PDT            4.08            131         0              Normal
  07/14/2025 06 AM PDT            4.08            131         0              Normal
  07/14/2025 07 AM PDT            4.08            131         0              Normal
  07/14/2025 08 AM PDT            4.08            131         0              Normal
  07/14/2025 09 AM PDT            4.08            131         0              Normal
  07/14/2025 10 AM PDT            4.08            131         0              Normal
  07/14/2025 11 AM PDT            4.08            131         0              Normal
  07/14/2025 12 PM PDT            4.07            130         -              Normal
  07/14/2025 01 PM PDT            4.07            130         0              Normal
  07/14/2025 02 PM PDT            4.07            130         0              Normal
  07/14/2025 03 PM PDT            4.07            130         0              Normal
  07/14/2025 04 PM PDT            4.07            130         0              Normal
  07/14/2025 05 PM PDT            4.07            130         0              Normal
  07/14/2025 06 PM PDT            4.06            128         -              Normal
  07/14/2025 07 PM PDT            4.06            128         0              Normal
  07/14/2025 08 PM PDT            4.06            128         0              Normal
  07/14/2025 09 PM PDT            4.06            128         0              Normal
  07/14/2025 10 PM PDT            4.06            128         0              Normal
  07/14/2025 11 PM PDT            4.06            128         0              Normal
  07/15/2025 12 AM PDT            4.06            128         0              Normal
  07/15/2025 01 AM PDT            4.06            128         0              Normal
  07/15/2025 02 AM PDT            4.06            128         0              Normal
  07/15/2025 03 AM PDT            4.06            128         0              Normal
  07/15/2025 04 AM PDT            4.06            128         0              Normal
  07/15/2025 05 AM PDT            4.06            128         0              Normal
  07/15/2025 06 AM PDT            4.06            128         0              Normal
  07/15/2025 07 AM PDT            4.06            128         0              Normal
  07/15/2025 08 AM PDT            4.06            128         0              Normal
  07/15/2025 09 AM PDT            4.06            128         0              Normal
  07/15/2025 10 AM PDT            4.06            128         0              Normal
  07/15/2025 11 AM PDT            4.06            128         0              Normal
  07/15/2025 12 PM PDT            4.06            128         0              Normal
  07/15/2025 01 PM PDT            4.06            128         0              Normal
  07/15/2025 02 PM PDT            4.06            128         0              Normal
  07/15/2025 03 PM PDT            4.06            128         0              Normal
  07/15/2025 04 PM PDT            4.06            128         0              Normal
  07/15/2025 05 PM PDT            4.06            128         0              Normal
  07/15/2025 06 PM PDT            4.05            126         -              Normal
  07/15/2025 07 PM PDT            4.05            126         0              Normal
  07/15/2025 08 PM PDT            4.05            126         0              Normal
  07/15/2025 09 PM PDT            4.05            126         0              Normal
  07/15/2025 10 PM PDT            4.05            126         0              Normal
  07/15/2025 11 PM PDT            4.05            126         0              Normal
  07/16/2025 12 AM PDT            4.05            126         0              Normal
  07/16/2025 01 AM PDT            4.05            126         0              Normal
  07/16/2025 02 AM PDT            4.05            126         0              Normal
  07/16/2025 03 AM PDT            4.05            126         0              Normal
  07/16/2025 04 AM PDT            4.05            126         0              Normal
  07/16/2025 05 AM PDT            4.05            126         0              Normal
  07/16/2025 06 AM PDT            4.05            126         0              Normal
  07/16/2025 07 AM PDT            4.05            126         0              Normal
  07/16/2025 08 AM PDT            4.05            126         0              Normal
  07/16/2025 09 AM PDT            4.05            126         0              Normal
  07/16/2025 10 AM PDT            4.05            126         0              Normal
  07/16/2025 11 AM PDT            4.05            126         0              Normal
  07/16/2025 12 PM PDT            4.05            126         0              Normal
  07/16/2025 01 PM PDT            4.05            126         0              Normal
  07/16/2025 02 PM PDT            4.05            126         0              Normal
  07/16/2025 03 PM PDT            4.05            126         0              Normal
  07/16/2025 04 PM PDT            4.05            126         0              Normal
  07/16/2025 05 PM PDT            4.05            126         0              Normal
  07/16/2025 06 PM PDT            4.05            126         0              Normal
  07/16/2025 07 PM PDT            4.05            126         0              Normal
  07/16/2025 08 PM PDT            4.05            126         0              Normal
  07/16/2025 09 PM PDT            4.05            126         0              Normal
  07/16/2025 10 PM PDT            4.06            128         +              Normal
  07/16/2025 11 PM PDT            4.06            128         0              Normal
  07/17/2025 12 AM PDT            4.06            128         0              Normal
  07/17/2025 01 AM PDT            4.06            128         0              Normal
  07/17/2025 02 AM PDT            4.06            128         0              Normal
  07/17/2025 03 AM PDT            4.06            128         0              Normal
  07/17/2025 04 AM PDT            4.06            128         0              Normal
  07/17/2025 05 AM PDT            4.06            128         0              Normal
  07/17/2025 06 AM PDT            4.06            128         0              Normal
  07/17/2025 07 AM PDT            4.06            128         0              Normal
  07/17/2025 08 AM PDT            4.06            128         0              Normal
  07/17/2025 09 AM PDT            4.06            128         0              Normal
  07/17/2025 10 AM PDT            4.06            128         0              Normal
  07/17/2025 11 AM PDT            4.06            128         0              Normal
  07/17/2025 12 PM PDT            4.06            128         0              Normal
  07/17/2025 01 PM PDT            4.06            128         0              Normal
  07/17/2025 02 PM PDT            4.06            128         0              Normal
  07/17/2025 03 PM PDT            4.06            128         0              Normal
  07/17/2025 04 PM PDT            4.06            128         0              Normal
  07/17/2025 05 PM PDT            4.06            128         0              Normal
  07/17/2025 06 PM PDT            4.06            128         0              Normal
  07/17/2025 07 PM PDT            4.06            128         0              Normal
  07/17/2025 08 PM PDT            4.06            128         0              Normal
  07/17/2025 09 PM PDT            4.06            128         0              Normal
  07/17/2025 10 PM PDT            4.06            128         0              Normal
  07/17/2025 11 PM PDT            4.07            130         +              Normal
  07/18/2025 12 AM PDT            4.07            130         0              Normal
  07/18/2025 01 AM PDT            4.07            130         0              Normal
  07/18/2025 02 AM PDT            4.07            130         0              Normal
  07/18/2025 03 AM PDT            4.07            130         0              Normal
  07/18/2025 04 AM PDT            4.07            130         0              Normal
  07/18/2025 05 AM PDT            4.07            130         0              Normal
#
# NOTE 1: Stages are rounded to the nearest hundredth (.01) of a foot.
# NOTE 2: Flows are rounded to the nearest (1) cfs.
# NOTE 3: Trends are determined using hourly change in unrounded stage and flow.
# NOTE 4: Maximum Values are determined using unrounded stage and flow.