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

*** IMPORTANT ***  Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.
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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: Jun 05 2025 at 7:45 AM PDTNext Issuance: Jun 06 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:  06/05/2025 at 07:45 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  06/03/2025 at 08:00 PM PDT
# Maximum Observed Stage:                       4.98 Feet
# Maximum Observed Flow:                        312 cfs
#
# Earliest Date & Time of Maximum Forecast:     06/06/2025 at 10:00 AM PDT
# Maximum Forecast Stage:                       4.91 Feet
# Maximum Forecast Flow:                        294 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  05/31/2025 07 AM PDT            4.90            291                        Normal
  05/31/2025 08 AM PDT            4.91            294         +              Normal
  05/31/2025 09 AM PDT            4.90            291         -              Normal
  05/31/2025 10 AM PDT            4.91            294         +              Normal
  05/31/2025 11 AM PDT            4.91            294         0              Normal
  05/31/2025 12 PM PDT            4.90            291         -              Normal
  05/31/2025 01 PM PDT            4.92            296         +              Normal
  05/31/2025 02 PM PDT            4.92            296         0              Normal
  05/31/2025 03 PM PDT            4.93            299         +              Normal
  05/31/2025 04 PM PDT            4.92            296         -              Normal
  05/31/2025 05 PM PDT            4.91            294         -              Normal
  05/31/2025 06 PM PDT            4.89            289         -              Normal
  05/31/2025 07 PM PDT            4.87            284         -              Normal
  05/31/2025 08 PM PDT            4.86            281         -              Normal
  05/31/2025 09 PM PDT            4.87            284         +              Normal
  05/31/2025 10 PM PDT            4.88            286         +              Normal
  05/31/2025 11 PM PDT            4.87            284         -              Normal
  06/01/2025 12 AM PDT            4.88            286         +              Normal
  06/01/2025 01 AM PDT            4.89            289         +              Normal
  06/01/2025 02 AM PDT            4.89            289         0              Normal
  06/01/2025 03 AM PDT            4.89            289         0              Normal
  06/01/2025 04 AM PDT            4.90            291         +              Normal
  06/01/2025 05 AM PDT            4.91            294         +              Normal
  06/01/2025 06 AM PDT            4.90            291         -              Normal
  06/01/2025 07 AM PDT            4.90            291         0              Normal
  06/01/2025 08 AM PDT            4.90            291         0              Normal
  06/01/2025 09 AM PDT            4.90            291         0              Normal
  06/01/2025 10 AM PDT            4.89            289         -              Normal
  06/01/2025 11 AM PDT            4.89            289         0              Normal
  06/01/2025 12 PM PDT            4.88            286         -              Normal
  06/01/2025 01 PM PDT            4.88            286         0              Normal
  06/01/2025 02 PM PDT            4.87            284         -              Normal
  06/01/2025 03 PM PDT            4.87            284         0              Normal
  06/01/2025 04 PM PDT            4.86            281         -              Normal
  06/01/2025 05 PM PDT            4.86            281         0              Normal
  06/01/2025 06 PM PDT            4.85            279         -              Normal
  06/01/2025 07 PM PDT            4.84            276         -              Normal
  06/01/2025 08 PM PDT            4.84            276         0              Normal
  06/01/2025 09 PM PDT            4.84            276         0              Normal
  06/01/2025 10 PM PDT            4.84            276         0              Normal
  06/01/2025 11 PM PDT            4.84            276         0              Normal
  06/02/2025 12 AM PDT            4.83            274         -              Normal
  06/02/2025 01 AM PDT            4.85            279         +              Normal
  06/02/2025 02 AM PDT            4.84            276         -              Normal
  06/02/2025 03 AM PDT            4.84            276         0              Normal
  06/02/2025 04 AM PDT            4.84            276         0              Normal
  06/02/2025 05 AM PDT            4.84            276         0              Normal
  06/02/2025 06 AM PDT            4.86            281         +              Normal
  06/02/2025 07 AM PDT            4.85            279         -              Normal
  06/02/2025 08 AM PDT            4.85            279         0              Normal
  06/02/2025 09 AM PDT            4.86            281         +              Normal
  06/02/2025 10 AM PDT            4.87            284         +              Normal
  06/02/2025 11 AM PDT            4.87            284         0              Normal
  06/02/2025 12 PM PDT            4.88            286         +              Normal
  06/02/2025 01 PM PDT            4.90            291         +              Normal
  06/02/2025 02 PM PDT            4.91            294         +              Normal
  06/02/2025 03 PM PDT            4.91            294         0              Normal
  06/02/2025 04 PM PDT            4.89            289         -              Normal
  06/02/2025 05 PM PDT            4.88            286         -              Normal
  06/02/2025 06 PM PDT            4.87            284         -              Normal
  06/02/2025 07 PM PDT            4.87            284         0              Normal
  06/02/2025 08 PM PDT            4.87            284         0              Normal
  06/02/2025 09 PM PDT            4.88            286         +              Normal
  06/02/2025 10 PM PDT            4.88            286         0              Normal
  06/02/2025 11 PM PDT            4.88            286         0              Normal
  06/03/2025 12 AM PDT            4.87            284         -              Normal
  06/03/2025 01 AM PDT            4.88            286         +              Normal
  06/03/2025 02 AM PDT            4.88            286         0              Normal
  06/03/2025 03 AM PDT            4.89            289         +              Normal
  06/03/2025 04 AM PDT            4.89            289         0              Normal
  06/03/2025 05 AM PDT            4.89            289         0              Normal
  06/03/2025 06 AM PDT            4.90            291         +              Normal
  06/03/2025 07 AM PDT            4.90            291         0              Normal
  06/03/2025 08 AM PDT            4.90            291         0              Normal
  06/03/2025 09 AM PDT            4.90            291         0              Normal
  06/03/2025 10 AM PDT            4.92            296         +              Normal
  06/03/2025 11 AM PDT            4.92            296         0              Normal
  06/03/2025 12 PM PDT            4.91            294         -              Normal
  06/03/2025 01 PM PDT            4.93            299         +              Normal
  06/03/2025 02 PM PDT            4.94            302         +              Normal
  06/03/2025 03 PM PDT            4.94            302         0              Normal
  06/03/2025 04 PM PDT            4.95            304         +              Normal
  06/03/2025 05 PM PDT            4.96            307         +              Normal
  06/03/2025 06 PM PDT            4.95            304         -              Normal
  06/03/2025 07 PM PDT            4.96            307         +              Normal
  06/03/2025 08 PM PDT            4.98            312         +              Normal
  06/03/2025 09 PM PDT            4.97            309         -              Normal
  06/03/2025 10 PM PDT            4.95            304         -              Normal
  06/03/2025 11 PM PDT            4.95            304         0              Normal
  06/04/2025 12 AM PDT            4.94            302         -              Normal
  06/04/2025 01 AM PDT            4.93            299         -              Normal
  06/04/2025 02 AM PDT            4.93            299         0              Normal
  06/04/2025 03 AM PDT            4.93            299         0              Normal
  06/04/2025 04 AM PDT            4.95            304         +              Normal
  06/04/2025 05 AM PDT            4.95            304         0              Normal
  06/04/2025 06 AM PDT            4.94            302         -              Normal
  06/04/2025 07 AM PDT            4.96            307         +              Normal
  06/04/2025 08 AM PDT            4.96            307         0              Normal
  06/04/2025 09 AM PDT            4.96            307         0              Normal
  06/04/2025 10 AM PDT            4.96            307         0              Normal
  06/04/2025 11 AM PDT            4.97            309         +              Normal
  06/04/2025 12 PM PDT            4.95            304         -              Normal
  06/04/2025 01 PM PDT            4.94            302         -              Normal
  06/04/2025 02 PM PDT            4.93            299         -              Normal
  06/04/2025 03 PM PDT            4.92            296         -              Normal
  06/04/2025 04 PM PDT            4.92            296         0              Normal
  06/04/2025 05 PM PDT            4.91            294         -              Normal
  06/04/2025 06 PM PDT            4.91            294         0              Normal
  06/04/2025 07 PM PDT            4.92            296         +              Normal
  06/04/2025 08 PM PDT            4.91            294         -              Normal
  06/04/2025 09 PM PDT            4.90            291         -              Normal
  06/04/2025 10 PM PDT            4.90            291         0              Normal
  06/04/2025 11 PM PDT            4.90            291         0              Normal
  06/05/2025 12 AM PDT            4.91            294         +              Normal
  06/05/2025 01 AM PDT            4.90            291         -              Normal
  06/05/2025 02 AM PDT            4.89            289         -              Normal
  06/05/2025 03 AM PDT            4.88            286         -              Normal
  06/05/2025 04 AM PDT            4.88            286         0              Normal
  06/05/2025 05 AM PDT            4.89            289         +              Normal
  06/05/2025 06 AM PDT            4.89            289         0              Normal
  06/05/2025 07 AM PDT            4.89            289         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  06/05/2025 08 AM PDT            4.89            289                        Normal
  06/05/2025 09 AM PDT            4.89            289         0              Normal
  06/05/2025 10 AM PDT            4.89            289         0              Normal
  06/05/2025 11 AM PDT            4.89            289         0              Normal
  06/05/2025 12 PM PDT            4.89            289         0              Normal
  06/05/2025 01 PM PDT            4.89            289         0              Normal
  06/05/2025 02 PM PDT            4.89            289         0              Normal
  06/05/2025 03 PM PDT            4.89            289         0              Normal
  06/05/2025 04 PM PDT            4.89            289         0              Normal
  06/05/2025 05 PM PDT            4.89            289         0              Normal
  06/05/2025 06 PM PDT            4.89            289         0              Normal
  06/05/2025 07 PM PDT            4.89            289         0              Normal
  06/05/2025 08 PM PDT            4.89            289         0              Normal
  06/05/2025 09 PM PDT            4.89            289         0              Normal
  06/05/2025 10 PM PDT            4.89            289         0              Normal
  06/05/2025 11 PM PDT            4.89            289         0              Normal
  06/06/2025 12 AM PDT            4.90            291         +              Normal
  06/06/2025 01 AM PDT            4.90            291         0              Normal
  06/06/2025 02 AM PDT            4.90            291         0              Normal
  06/06/2025 03 AM PDT            4.90            291         0              Normal
  06/06/2025 04 AM PDT            4.90            291         0              Normal
  06/06/2025 05 AM PDT            4.90            291         0              Normal
  06/06/2025 06 AM PDT            4.90            291         0              Normal
  06/06/2025 07 AM PDT            4.90            291         0              Normal
  06/06/2025 08 AM PDT            4.90            291         0              Normal
  06/06/2025 09 AM PDT            4.90            291         0              Normal
  06/06/2025 10 AM PDT            4.91            294         +              Normal
  06/06/2025 11 AM PDT            4.91            294         0              Normal
  06/06/2025 12 PM PDT            4.91            294         0              Normal
  06/06/2025 01 PM PDT            4.91            294         0              Normal
  06/06/2025 02 PM PDT            4.91            294         0              Normal
  06/06/2025 03 PM PDT            4.91            294         0              Normal
  06/06/2025 04 PM PDT            4.91            294         0              Normal
  06/06/2025 05 PM PDT            4.91            294         0              Normal
  06/06/2025 06 PM PDT            4.90            291         -              Normal
  06/06/2025 07 PM PDT            4.90            291         0              Normal
  06/06/2025 08 PM PDT            4.90            291         0              Normal
  06/06/2025 09 PM PDT            4.90            291         0              Normal
  06/06/2025 10 PM PDT            4.90            291         0              Normal
  06/06/2025 11 PM PDT            4.90            291         0              Normal
  06/07/2025 12 AM PDT            4.90            291         0              Normal
  06/07/2025 01 AM PDT            4.91            294         +              Normal
  06/07/2025 02 AM PDT            4.91            294         0              Normal
  06/07/2025 03 AM PDT            4.91            294         0              Normal
  06/07/2025 04 AM PDT            4.91            294         0              Normal
  06/07/2025 05 AM PDT            4.91            294         0              Normal
  06/07/2025 06 AM PDT            4.91            294         0              Normal
  06/07/2025 07 AM PDT            4.91            294         0              Normal
  06/07/2025 08 AM PDT            4.91            294         0              Normal
  06/07/2025 09 AM PDT            4.91            294         0              Normal
  06/07/2025 10 AM PDT            4.91            294         0              Normal
  06/07/2025 11 AM PDT            4.91            294         0              Normal
  06/07/2025 12 PM PDT            4.91            294         0              Normal
  06/07/2025 01 PM PDT            4.91            294         0              Normal
  06/07/2025 02 PM PDT            4.91            294         0              Normal
  06/07/2025 03 PM PDT            4.91            294         0              Normal
  06/07/2025 04 PM PDT            4.91            294         0              Normal
  06/07/2025 05 PM PDT            4.91            294         0              Normal
  06/07/2025 06 PM PDT            4.91            294         0              Normal
  06/07/2025 07 PM PDT            4.91            294         0              Normal
  06/07/2025 08 PM PDT            4.91            294         0              Normal
  06/07/2025 09 PM PDT            4.91            294         0              Normal
  06/07/2025 10 PM PDT            4.91            294         0              Normal
  06/07/2025 11 PM PDT            4.91            294         0              Normal
  06/08/2025 12 AM PDT            4.91            294         0              Normal
  06/08/2025 01 AM PDT            4.91            294         0              Normal
  06/08/2025 02 AM PDT            4.91            294         0              Normal
  06/08/2025 03 AM PDT            4.91            294         0              Normal
  06/08/2025 04 AM PDT            4.91            294         0              Normal
  06/08/2025 05 AM PDT            4.91            294         0              Normal
  06/08/2025 06 AM PDT            4.91            294         0              Normal
  06/08/2025 07 AM PDT            4.91            294         0              Normal
  06/08/2025 08 AM PDT            4.91            294         0              Normal
  06/08/2025 09 AM PDT            4.91            294         0              Normal
  06/08/2025 10 AM PDT            4.91            294         0              Normal
  06/08/2025 11 AM PDT            4.91            294         0              Normal
  06/08/2025 12 PM PDT            4.91            294         0              Normal
  06/08/2025 01 PM PDT            4.91            294         0              Normal
  06/08/2025 02 PM PDT            4.91            294         0              Normal
  06/08/2025 03 PM PDT            4.91            294         0              Normal
  06/08/2025 04 PM PDT            4.91            294         0              Normal
  06/08/2025 05 PM PDT            4.91            294         0              Normal
  06/08/2025 06 PM PDT            4.91            294         0              Normal
  06/08/2025 07 PM PDT            4.91            294         0              Normal
  06/08/2025 08 PM PDT            4.91            294         0              Normal
  06/08/2025 09 PM PDT            4.91            294         0              Normal
  06/08/2025 10 PM PDT            4.91            294         0              Normal
  06/08/2025 11 PM PDT            4.91            294         0              Normal
  06/09/2025 12 AM PDT            4.91            294         0              Normal
  06/09/2025 01 AM PDT            4.91            294         0              Normal
  06/09/2025 02 AM PDT            4.91            294         0              Normal
  06/09/2025 03 AM PDT            4.91            294         0              Normal
  06/09/2025 04 AM PDT            4.91            294         0              Normal
  06/09/2025 05 AM PDT            4.91            294         0              Normal
  06/09/2025 06 AM PDT            4.91            294         0              Normal
  06/09/2025 07 AM PDT            4.91            294         0              Normal
  06/09/2025 08 AM PDT            4.91            294         0              Normal
  06/09/2025 09 AM PDT            4.91            294         0              Normal
  06/09/2025 10 AM PDT            4.91            294         0              Normal
  06/09/2025 11 AM PDT            4.91            294         0              Normal
  06/09/2025 12 PM PDT            4.91            294         0              Normal
  06/09/2025 01 PM PDT            4.91            294         0              Normal
  06/09/2025 02 PM PDT            4.91            294         0              Normal
  06/09/2025 03 PM PDT            4.91            294         0              Normal
  06/09/2025 04 PM PDT            4.91            294         0              Normal
  06/09/2025 05 PM PDT            4.91            294         0              Normal
  06/09/2025 06 PM PDT            4.91            294         0              Normal
  06/09/2025 07 PM PDT            4.91            294         0              Normal
  06/09/2025 08 PM PDT            4.91            294         0              Normal
  06/09/2025 09 PM PDT            4.91            294         0              Normal
  06/09/2025 10 PM PDT            4.91            294         0              Normal
  06/09/2025 11 PM PDT            4.91            294         0              Normal
  06/10/2025 12 AM PDT            4.91            294         0              Normal
  06/10/2025 01 AM PDT            4.91            294         0              Normal
  06/10/2025 02 AM PDT            4.91            294         0              Normal
  06/10/2025 03 AM PDT            4.91            294         0              Normal
  06/10/2025 04 AM PDT            4.91            294         0              Normal
  06/10/2025 05 AM PDT            4.91            294         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.