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 16 2025 at 6:18 AM PDTNext Issuance: Jun 17 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:  06/16/2025 at 06:18 AM PDT
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  06/11/2025 at 02:00 PM PDT
# Maximum Observed Stage:                       5.07 Feet
# Maximum Observed Flow:                        336 cfs
#
# Earliest Date & Time of Maximum Forecast:     06/16/2025 at 07:00 AM PDT
# Maximum Forecast Stage:                       4.39 Feet
# Maximum Forecast Flow:                        175 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  06/11/2025 06 AM PDT            5.06            334                        Normal
  06/11/2025 07 AM PDT            5.06            334         0              Normal
  06/11/2025 08 AM PDT            5.06            334         0              Normal
  06/11/2025 09 AM PDT            5.06            334         0              Normal
  06/11/2025 10 AM PDT            5.06            334         0              Normal
  06/11/2025 11 AM PDT            5.06            334         0              Normal
  06/11/2025 12 PM PDT            5.07            336         +              Normal
  06/11/2025 01 PM PDT            5.07            336         0              Normal
  06/11/2025 02 PM PDT            5.07            336         0              Normal
  06/11/2025 03 PM PDT            5.06            334         -              Normal
  06/11/2025 04 PM PDT            5.04            328         -              Normal
  06/11/2025 05 PM PDT            5.03            325         -              Normal
  06/11/2025 06 PM PDT            5.03            325         0              Normal
  06/11/2025 07 PM PDT            5.02            323         -              Normal
  06/11/2025 08 PM PDT            5.01            320         -              Normal
  06/11/2025 09 PM PDT            5.01            320         0              Normal
  06/11/2025 10 PM PDT            5.00            317         -              Normal
  06/11/2025 11 PM PDT            4.99            315         -              Normal
  06/12/2025 12 AM PDT            4.99            315         0              Normal
  06/12/2025 01 AM PDT            5.00            317         +              Normal
  06/12/2025 02 AM PDT            5.01            320         +              Normal
  06/12/2025 03 AM PDT            5.02            323         +              Normal
  06/12/2025 04 AM PDT            5.01            320         -              Normal
  06/12/2025 05 AM PDT            5.00            317         -              Normal
  06/12/2025 06 AM PDT            5.00            317         0              Normal
  06/12/2025 07 AM PDT            5.00            317         0              Normal
  06/12/2025 08 AM PDT            5.00            317         0              Normal
  06/12/2025 09 AM PDT            5.00            317         0              Normal
  06/12/2025 10 AM PDT            5.00            317         0              Normal
  06/12/2025 11 AM PDT            4.98            312         -              Normal
  06/12/2025 12 PM PDT            4.95            304         -              Normal
  06/12/2025 01 PM PDT            4.94            302         -              Normal
  06/12/2025 02 PM PDT            4.92            296         -              Normal
  06/12/2025 03 PM PDT            4.92            296         0              Normal
  06/12/2025 04 PM PDT            4.91            294         -              Normal
  06/12/2025 05 PM PDT            4.90            291         -              Normal
  06/12/2025 06 PM PDT            4.90            291         0              Normal
  06/12/2025 07 PM PDT            4.89            289         -              Normal
  06/12/2025 08 PM PDT            4.88            286         -              Normal
  06/12/2025 09 PM PDT            4.88            286         0              Normal
  06/12/2025 10 PM PDT            4.88            286         0              Normal
  06/12/2025 11 PM PDT            4.87            284         -              Normal
  06/13/2025 12 AM PDT            4.88            286         +              Normal
  06/13/2025 01 AM PDT            4.88            286         0              Normal
  06/13/2025 02 AM PDT            4.88            286         0              Normal
  06/13/2025 03 AM PDT            4.87            284         -              Normal
  06/13/2025 04 AM PDT            4.88            286         +              Normal
  06/13/2025 05 AM PDT            4.87            284         -              Normal
  06/13/2025 06 AM PDT            4.87            284         0              Normal
  06/13/2025 07 AM PDT            4.88            286         +              Normal
  06/13/2025 08 AM PDT            4.89            289         +              Normal
  06/13/2025 09 AM PDT            4.89            289         0              Normal
  06/13/2025 10 AM PDT            4.89            289         0              Normal
  06/13/2025 11 AM PDT            4.90            291         +              Normal
  06/13/2025 12 PM PDT            4.90            291         0              Normal
  06/13/2025 01 PM PDT            4.90            291         0              Normal
  06/13/2025 02 PM PDT            4.89            289         -              Normal
  06/13/2025 03 PM PDT            4.89            289         0              Normal
  06/13/2025 04 PM PDT            4.89            289         0              Normal
  06/13/2025 05 PM PDT            4.90            291         +              Normal
  06/13/2025 06 PM PDT            4.91            294         +              Normal
  06/13/2025 07 PM PDT            4.89            289         -              Normal
  06/13/2025 08 PM PDT            4.90            291         +              Normal
  06/13/2025 09 PM PDT            4.90            291         0              Normal
  06/13/2025 10 PM PDT            4.89            289         -              Normal
  06/13/2025 11 PM PDT            4.90            291         +              Normal
  06/14/2025 12 AM PDT            4.90            291         0              Normal
  06/14/2025 01 AM PDT            4.89            289         -              Normal
  06/14/2025 02 AM PDT            4.89            289         0              Normal
  06/14/2025 03 AM PDT            4.90            291         +              Normal
  06/14/2025 04 AM PDT            4.89            289         -              Normal
  06/14/2025 05 AM PDT            4.90            291         +              Normal
  06/14/2025 06 AM PDT            4.89            289         -              Normal
  06/14/2025 07 AM PDT            4.89            289         0              Normal
  06/14/2025 08 AM PDT            4.89            289         0              Normal
  06/14/2025 09 AM PDT            4.89            289         0              Normal
  06/14/2025 10 AM PDT            4.90            291         +              Normal
  06/14/2025 11 AM PDT            4.89            289         -              Normal
  06/14/2025 12 PM PDT            4.89            289         0              Normal
  06/14/2025 01 PM PDT            4.89            289         0              Normal
  06/14/2025 02 PM PDT            4.88            286         -              Normal
  06/14/2025 03 PM PDT            4.87            284         -              Normal
  06/14/2025 04 PM PDT            4.87            284         0              Normal
  06/14/2025 05 PM PDT            4.86            281         -              Normal
  06/14/2025 06 PM PDT            4.84            276         -              Normal
  06/14/2025 07 PM PDT            4.83            274         -              Normal
  06/14/2025 08 PM PDT            4.82            271         -              Normal
  06/14/2025 09 PM PDT            4.82            271         0              Normal
  06/14/2025 10 PM PDT            4.81            269         -              Normal
  06/14/2025 11 PM PDT            4.80            266         -              Normal
  06/15/2025 12 AM PDT            4.80            266         0              Normal
  06/15/2025 01 AM PDT            4.79            264         -              Normal
  06/15/2025 02 AM PDT            4.79            264         0              Normal
  06/15/2025 03 AM PDT            4.80            266         +              Normal
  06/15/2025 04 AM PDT            4.78            261         -              Normal
  06/15/2025 05 AM PDT            4.75            254         -              Normal
  06/15/2025 06 AM PDT            4.71            245         -              Normal
  06/15/2025 07 AM PDT            4.67            235         -              Normal
  06/15/2025 08 AM PDT            4.62            224         -              Normal
  06/15/2025 09 AM PDT            4.59            217         -              Normal
  06/15/2025 10 AM PDT            4.57            213         -              Normal
  06/15/2025 11 AM PDT            4.54            206         -              Normal
  06/15/2025 12 PM PDT            4.52            202         -              Normal
  06/15/2025 01 PM PDT            4.51            200         -              Normal
  06/15/2025 02 PM PDT            4.50            197         -              Normal
  06/15/2025 03 PM PDT            4.48            193         -              Normal
  06/15/2025 04 PM PDT            4.47            191         -              Normal
  06/15/2025 05 PM PDT            4.46            189         -              Normal
  06/15/2025 06 PM PDT            4.45            187         -              Normal
  06/15/2025 07 PM PDT            4.43            183         -              Normal
  06/15/2025 08 PM PDT            4.42            181         -              Normal
  06/15/2025 09 PM PDT            4.42            181         0              Normal
  06/15/2025 10 PM PDT            4.41            179         -              Normal
  06/15/2025 11 PM PDT            4.40            177         -              Normal
  06/16/2025 12 AM PDT            4.40            177         0              Normal
  06/16/2025 01 AM PDT            4.39            175         -              Normal
  06/16/2025 02 AM PDT            4.39            175         0              Normal
  06/16/2025 03 AM PDT            4.39            175         0              Normal
  06/16/2025 04 AM PDT            4.39            175         0              Normal
  06/16/2025 05 AM PDT            4.39            175         0              Normal
  06/16/2025 06 AM PDT            4.39            175         0              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  06/16/2025 07 AM PDT            4.39            175                        Normal
  06/16/2025 08 AM PDT            4.39            175         0              Normal
  06/16/2025 09 AM PDT            4.39            175         0              Normal
  06/16/2025 10 AM PDT            4.39            175         0              Normal
  06/16/2025 11 AM PDT            4.39            175         0              Normal
  06/16/2025 12 PM PDT            4.39            175         0              Normal
  06/16/2025 01 PM PDT            4.39            175         0              Normal
  06/16/2025 02 PM PDT            4.39            175         0              Normal
  06/16/2025 03 PM PDT            4.39            175         0              Normal
  06/16/2025 04 PM PDT            4.39            175         0              Normal
  06/16/2025 05 PM PDT            4.39            175         0              Normal
  06/16/2025 06 PM PDT            4.39            175         0              Normal
  06/16/2025 07 PM PDT            4.39            175         0              Normal
  06/16/2025 08 PM PDT            4.39            175         0              Normal
  06/16/2025 09 PM PDT            4.39            175         0              Normal
  06/16/2025 10 PM PDT            4.39            175         0              Normal
  06/16/2025 11 PM PDT            4.39            175         0              Normal
  06/17/2025 12 AM PDT            4.39            175         0              Normal
  06/17/2025 01 AM PDT            4.39            175         0              Normal
  06/17/2025 02 AM PDT            4.39            175         0              Normal
  06/17/2025 03 AM PDT            4.39            175         0              Normal
  06/17/2025 04 AM PDT            4.39            175         0              Normal
  06/17/2025 05 AM PDT            4.39            175         0              Normal
  06/17/2025 06 AM PDT            4.39            175         0              Normal
  06/17/2025 07 AM PDT            4.39            175         0              Normal
  06/17/2025 08 AM PDT            4.39            175         0              Normal
  06/17/2025 09 AM PDT            4.39            175         0              Normal
  06/17/2025 10 AM PDT            4.39            175         0              Normal
  06/17/2025 11 AM PDT            4.39            175         0              Normal
  06/17/2025 12 PM PDT            4.39            175         0              Normal
  06/17/2025 01 PM PDT            4.39            175         0              Normal
  06/17/2025 02 PM PDT            4.39            175         0              Normal
  06/17/2025 03 PM PDT            4.39            175         0              Normal
  06/17/2025 04 PM PDT            4.39            175         0              Normal
  06/17/2025 05 PM PDT            4.39            175         0              Normal
  06/17/2025 06 PM PDT            4.38            173         -              Normal
  06/17/2025 07 PM PDT            4.38            173         0              Normal
  06/17/2025 08 PM PDT            4.38            173         0              Normal
  06/17/2025 09 PM PDT            4.38            173         0              Normal
  06/17/2025 10 PM PDT            4.38            173         0              Normal
  06/17/2025 11 PM PDT            4.38            173         0              Normal
  06/18/2025 12 AM PDT            4.38            173         0              Normal
  06/18/2025 01 AM PDT            4.38            173         0              Normal
  06/18/2025 02 AM PDT            4.38            173         0              Normal
  06/18/2025 03 AM PDT            4.38            173         0              Normal
  06/18/2025 04 AM PDT            4.38            173         0              Normal
  06/18/2025 05 AM PDT            4.38            173         0              Normal
  06/18/2025 06 AM PDT            4.38            173         0              Normal
  06/18/2025 07 AM PDT            4.38            173         0              Normal
  06/18/2025 08 AM PDT            4.38            173         0              Normal
  06/18/2025 09 AM PDT            4.38            173         0              Normal
  06/18/2025 10 AM PDT            4.38            173         0              Normal
  06/18/2025 11 AM PDT            4.38            173         0              Normal
  06/18/2025 12 PM PDT            4.38            173         0              Normal
  06/18/2025 01 PM PDT            4.38            173         0              Normal
  06/18/2025 02 PM PDT            4.38            173         0              Normal
  06/18/2025 03 PM PDT            4.38            173         0              Normal
  06/18/2025 04 PM PDT            4.38            173         0              Normal
  06/18/2025 05 PM PDT            4.38            173         0              Normal
  06/18/2025 06 PM PDT            4.37            171         -              Normal
  06/18/2025 07 PM PDT            4.37            171         0              Normal
  06/18/2025 08 PM PDT            4.37            171         0              Normal
  06/18/2025 09 PM PDT            4.37            171         0              Normal
  06/18/2025 10 PM PDT            4.37            171         0              Normal
  06/18/2025 11 PM PDT            4.37            171         0              Normal
  06/19/2025 12 AM PDT            4.37            171         0              Normal
  06/19/2025 01 AM PDT            4.37            171         0              Normal
  06/19/2025 02 AM PDT            4.37            171         0              Normal
  06/19/2025 03 AM PDT            4.37            171         0              Normal
  06/19/2025 04 AM PDT            4.37            171         0              Normal
  06/19/2025 05 AM PDT            4.37            171         0              Normal
  06/19/2025 06 AM PDT            4.37            171         0              Normal
  06/19/2025 07 AM PDT            4.37            171         0              Normal
  06/19/2025 08 AM PDT            4.37            171         0              Normal
  06/19/2025 09 AM PDT            4.37            171         0              Normal
  06/19/2025 10 AM PDT            4.37            171         0              Normal
  06/19/2025 11 AM PDT            4.37            171         0              Normal
  06/19/2025 12 PM PDT            4.37            171         0              Normal
  06/19/2025 01 PM PDT            4.37            171         0              Normal
  06/19/2025 02 PM PDT            4.37            171         0              Normal
  06/19/2025 03 PM PDT            4.37            171         0              Normal
  06/19/2025 04 PM PDT            4.37            171         0              Normal
  06/19/2025 05 PM PDT            4.37            171         0              Normal
  06/19/2025 06 PM PDT            4.36            169         -              Normal
  06/19/2025 07 PM PDT            4.36            169         0              Normal
  06/19/2025 08 PM PDT            4.36            169         0              Normal
  06/19/2025 09 PM PDT            4.36            169         0              Normal
  06/19/2025 10 PM PDT            4.36            169         0              Normal
  06/19/2025 11 PM PDT            4.36            169         0              Normal
  06/20/2025 12 AM PDT            4.36            169         0              Normal
  06/20/2025 01 AM PDT            4.36            169         0              Normal
  06/20/2025 02 AM PDT            4.36            169         0              Normal
  06/20/2025 03 AM PDT            4.36            169         0              Normal
  06/20/2025 04 AM PDT            4.36            169         0              Normal
  06/20/2025 05 AM PDT            4.37            171         +              Normal
  06/20/2025 06 AM PDT            4.37            171         0              Normal
  06/20/2025 07 AM PDT            4.37            171         0              Normal
  06/20/2025 08 AM PDT            4.37            171         0              Normal
  06/20/2025 09 AM PDT            4.37            171         0              Normal
  06/20/2025 10 AM PDT            4.37            171         0              Normal
  06/20/2025 11 AM PDT            4.37            171         0              Normal
  06/20/2025 12 PM PDT            4.37            171         0              Normal
  06/20/2025 01 PM PDT            4.37            171         0              Normal
  06/20/2025 02 PM PDT            4.37            171         0              Normal
  06/20/2025 03 PM PDT            4.37            171         0              Normal
  06/20/2025 04 PM PDT            4.37            171         0              Normal
  06/20/2025 05 PM PDT            4.37            171         0              Normal
  06/20/2025 06 PM PDT            4.36            169         -              Normal
  06/20/2025 07 PM PDT            4.36            169         0              Normal
  06/20/2025 08 PM PDT            4.36            169         0              Normal
  06/20/2025 09 PM PDT            4.36            169         0              Normal
  06/20/2025 10 PM PDT            4.36            169         0              Normal
  06/20/2025 11 PM PDT            4.36            169         0              Normal
  06/21/2025 12 AM PDT            4.36            169         0              Normal
  06/21/2025 01 AM PDT            4.36            169         0              Normal
  06/21/2025 02 AM PDT            4.36            169         0              Normal
  06/21/2025 03 AM PDT            4.36            169         0              Normal
  06/21/2025 04 AM PDT            4.36            169         0              Normal
  06/21/2025 05 AM PDT            4.36            169         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.