MERCED RIVER - YOSEMITE NP AT HAPPY ISLES (HPIC1)
Latitude: 37.73º NLongitude: 119.56º WElevation: 4017 Feet
Location: Mariposa County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Dec 26 2025 at 9:01 AM PSTNext Issuance: Dec 26 2025 at 3:00 PM PST
Action/Monitor: N/A Minor Flood: 7.5 FeetModerate Flood: 10.0 FeetMajor Flood: 13.27 Feet

# Tabular Observed and Forecast Hydrograph Information
#
# Location: Merced River - Yosemite NP at Happy Isles (HPIC1)
#
# File Generation Time:  12/26/2025 at 09:01 AM PST
# Data Interval:  1 Hour
#
# Most Recent Date & Time of Maximum Observed:  12/24/2025 at 02:00 PM PST
# Maximum Observed Stage:                       2.91 Feet
# Maximum Observed Flow:                        312 cfs
#
# Earliest Date & Time of Maximum Forecast:     12/26/2025 at 09:00 AM PST
# Maximum Forecast Stage:                       2.59 Feet
# Maximum Forecast Flow:                        219 cfs
#
# OBSERVED
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Observed Status
# ---------------------------------------------------------------------------------
  12/21/2025 09 AM PST            2.26            130                        Normal
  12/21/2025 10 AM PST            2.27            132         +              Normal
  12/21/2025 11 AM PST            2.32            145         +              Normal
  12/21/2025 12 PM PST            2.36            156         +              Normal
  12/21/2025 01 PM PST            2.40            167         +              Normal
  12/21/2025 02 PM PST            2.41            170         +              Normal
  12/21/2025 03 PM PST            2.42            172         +              Normal
  12/21/2025 04 PM PST            2.45            181         +              Normal
  12/21/2025 05 PM PST            2.49            192         +              Normal
  12/21/2025 06 PM PST            2.51            197         +              Normal
  12/21/2025 07 PM PST            2.53            203         +              Normal
  12/21/2025 08 PM PST            2.55            208         +              Normal
  12/21/2025 09 PM PST            2.56            211         +              Normal
  12/21/2025 10 PM PST            2.55            208         -              Normal
  12/21/2025 11 PM PST            2.55            208         0              Normal
  12/22/2025 12 AM PST            2.55            208         0              Normal
  12/22/2025 01 AM PST            2.54            206         -              Normal
  12/22/2025 02 AM PST            2.55            208         +              Normal
  12/22/2025 03 AM PST            2.53            203         -              Normal
  12/22/2025 04 AM PST            2.52            200         -              Normal
  12/22/2025 05 AM PST            2.50            194         -              Normal
  12/22/2025 06 AM PST            2.50            194         0              Normal
  12/22/2025 07 AM PST            2.50            194         0              Normal
  12/22/2025 08 AM PST            2.48            189         -              Normal
  12/22/2025 09 AM PST            2.47            186         -              Normal
  12/22/2025 10 AM PST            2.46            184         -              Normal
  12/22/2025 11 AM PST            2.44            178         -              Normal
  12/22/2025 12 PM PST            2.43            175         -              Normal
  12/22/2025 01 PM PST            2.41            170         -              Normal
  12/22/2025 02 PM PST            2.41            170         0              Normal
  12/22/2025 03 PM PST            2.39            164         -              Normal
  12/22/2025 04 PM PST            2.39            164         0              Normal
  12/22/2025 05 PM PST            2.37            159         -              Normal
  12/22/2025 06 PM PST            2.36            156         -              Normal
  12/22/2025 07 PM PST            2.35            154         -              Normal
  12/22/2025 08 PM PST            2.35            154         0              Normal
  12/22/2025 09 PM PST            2.33            148         -              Normal
  12/22/2025 10 PM PST            2.32            145         -              Normal
  12/22/2025 11 PM PST            2.31            143         -              Normal
  12/23/2025 12 AM PST            2.30            140         -              Normal
  12/23/2025 01 AM PST            2.29            137         -              Normal
  12/23/2025 02 AM PST            2.29            137         0              Normal
  12/23/2025 03 AM PST            2.28            135         -              Normal
  12/23/2025 04 AM PST            2.27            132         -              Normal
  12/23/2025 05 AM PST            2.27            132         0              Normal
  12/23/2025 06 AM PST            2.26            130         -              Normal
  12/23/2025 07 AM PST            2.24            125         -              Normal
  12/23/2025 08 AM PST            2.24            125         0              Normal
  12/23/2025 09 AM PST            2.22            121         -              Normal
  12/23/2025 10 AM PST            2.22            121         0              Normal
  12/23/2025 11 AM PST            2.20            117         -              Normal
  12/23/2025 12 PM PST            2.19            115         -              Normal
  12/23/2025 01 PM PST            2.19            115         0              Normal
  12/23/2025 02 PM PST            2.18            113         -              Normal
  12/23/2025 03 PM PST            2.18            113         0              Normal
  12/23/2025 04 PM PST            2.15            107         -              Normal
  12/23/2025 05 PM PST            2.15            107         0              Normal
  12/23/2025 06 PM PST            2.15            107         0              Normal
  12/23/2025 07 PM PST            2.15            107         0              Normal
  12/23/2025 08 PM PST            2.13            103         -              Normal
  12/23/2025 09 PM PST            2.13            103         0              Normal
  12/23/2025 10 PM PST            2.14            105         +              Normal
  12/23/2025 11 PM PST            2.14            105         0              Normal
  12/24/2025 12 AM PST            2.14            105         0              Normal
  12/24/2025 01 AM PST            2.15            107         +              Normal
  12/24/2025 02 AM PST            2.18            113         +              Normal
  12/24/2025 03 AM PST            2.20            117         +              Normal
  12/24/2025 04 AM PST            2.25            127         +              Normal
  12/24/2025 05 AM PST            2.33            148         +              Normal
  12/24/2025 06 AM PST            2.37            159         +              Normal
  12/24/2025 07 AM PST            2.42            172         +              Normal
  12/24/2025 08 AM PST            2.46            184         +              Normal
  12/24/2025 09 AM PST            2.52            200         +              Normal
  12/24/2025 10 AM PST            2.57            213         +              Normal
  12/24/2025 11 AM PST            2.62            227         +              Normal
  12/24/2025 12 PM PST            2.86            296         +              Normal
  12/24/2025 01 PM PST            2.88            303         +              Normal
  12/24/2025 02 PM PST            2.91            312         +              Normal
  12/24/2025 03 PM PST            2.86            296         -              Normal
  12/24/2025 04 PM PST            2.82            284         -              Normal
  12/24/2025 05 PM PST            2.80            278         -              Normal
  12/24/2025 06 PM PST            2.75            263         -              Normal
  12/24/2025 07 PM PST            2.71            252         -              Normal
  12/24/2025 08 PM PST            2.70            249         -              Normal
  12/24/2025 09 PM PST            2.69            246         -              Normal
  12/24/2025 10 PM PST            2.68            243         -              Normal
  12/24/2025 11 PM PST            2.71            252         +              Normal
  12/25/2025 12 AM PST            2.67            240         -              Normal
  12/25/2025 01 AM PST            2.63            229         -              Normal
  12/25/2025 02 AM PST            2.59            219         -              Normal
  12/25/2025 03 AM PST            2.57            213         -              Normal
  12/25/2025 04 AM PST            2.54            206         -              Normal
  12/25/2025 05 AM PST            2.52            200         -              Normal
  12/25/2025 06 AM PST            2.52            200         0              Normal
  12/25/2025 07 AM PST            2.54            206         +              Normal
  12/25/2025 08 AM PST            2.59            219         +              Normal
  12/25/2025 09 AM PST            2.63            229         +              Normal
  12/25/2025 10 AM PST            2.65            235         +              Normal
  12/25/2025 11 AM PST            2.61            224         -              Normal
  12/25/2025 12 PM PST            2.60            221         -              Normal
  12/25/2025 01 PM PST            2.58            216         -              Normal
  12/25/2025 02 PM PST            2.55            208         -              Normal
  12/25/2025 03 PM PST            2.55            208         0              Normal
  12/25/2025 04 PM PST            2.55            208         0              Normal
  12/25/2025 05 PM PST            2.55            208         0              Normal
  12/25/2025 06 PM PST            2.54            206         -              Normal
  12/25/2025 07 PM PST            2.53            203         -              Normal
  12/25/2025 08 PM PST            2.52            200         -              Normal
  12/25/2025 09 PM PST            2.51            197         -              Normal
  12/25/2025 10 PM PST            2.51            197         0              Normal
  12/25/2025 11 PM PST            2.51            197         0              Normal
  12/26/2025 12 AM PST            2.50            194         -              Normal
  12/26/2025 01 AM PST            2.51            197         +              Normal
  12/26/2025 02 AM PST            2.52            200         +              Normal
  12/26/2025 03 AM PST            2.54            206         +              Normal
  12/26/2025 04 AM PST            2.56            211         +              Normal
  12/26/2025 05 AM PST            2.59            219         +              Normal
  12/26/2025 06 AM PST            2.64            232         +              Normal
  12/26/2025 07 AM PST            2.62            227         -              Normal
  12/26/2025 08 AM PST            2.61            224         -              Normal
#
# FORECAST
#
# Date & Time  (Local)    Stage (Feet)     Flow (cfs)     Trend     Forecast Status
# ---------------------------------------------------------------------------------
  12/26/2025 09 AM PST            2.59            219                        Normal
  12/26/2025 10 AM PST            2.56            211         -              Normal
  12/26/2025 11 AM PST            2.54            206         -              Normal
  12/26/2025 12 PM PST            2.52            200         -              Normal
  12/26/2025 01 PM PST            2.51            197         -              Normal
  12/26/2025 02 PM PST            2.49            192         -              Normal
  12/26/2025 03 PM PST            2.48            189         -              Normal
  12/26/2025 04 PM PST            2.47            186         -              Normal
  12/26/2025 05 PM PST            2.46            184         -              Normal
  12/26/2025 06 PM PST            2.45            181         -              Normal
  12/26/2025 07 PM PST            2.44            178         -              Normal
  12/26/2025 08 PM PST            2.43            175         -              Normal
  12/26/2025 09 PM PST            2.42            172         -              Normal
  12/26/2025 10 PM PST            2.41            170         -              Normal
  12/26/2025 11 PM PST            2.40            167         -              Normal
  12/27/2025 12 AM PST            2.39            164         -              Normal
  12/27/2025 01 AM PST            2.38            161         -              Normal
  12/27/2025 02 AM PST            2.38            161         0              Normal
  12/27/2025 03 AM PST            2.37            159         -              Normal
  12/27/2025 04 AM PST            2.36            156         -              Normal
  12/27/2025 05 AM PST            2.35            154         -              Normal
  12/27/2025 06 AM PST            2.34            151         -              Normal
  12/27/2025 07 AM PST            2.34            151         0              Normal
  12/27/2025 08 AM PST            2.33            148         -              Normal
  12/27/2025 09 AM PST            2.33            148         0              Normal
  12/27/2025 10 AM PST            2.32            145         -              Normal
  12/27/2025 11 AM PST            2.32            145         0              Normal
  12/27/2025 12 PM PST            2.31            143         -              Normal
  12/27/2025 01 PM PST            2.31            143         0              Normal
  12/27/2025 02 PM PST            2.30            140         -              Normal
  12/27/2025 03 PM PST            2.30            140         0              Normal
  12/27/2025 04 PM PST            2.29            137         -              Normal
  12/27/2025 05 PM PST            2.29            137         0              Normal
  12/27/2025 06 PM PST            2.29            137         0              Normal
  12/27/2025 07 PM PST            2.28            135         -              Normal
  12/27/2025 08 PM PST            2.28            135         0              Normal
  12/27/2025 09 PM PST            2.27            132         -              Normal
  12/27/2025 10 PM PST            2.27            132         0              Normal
  12/27/2025 11 PM PST            2.27            132         0              Normal
  12/28/2025 12 AM PST            2.27            132         0              Normal
  12/28/2025 01 AM PST            2.26            130         -              Normal
  12/28/2025 02 AM PST            2.26            130         0              Normal
  12/28/2025 03 AM PST            2.25            127         -              Normal
  12/28/2025 04 AM PST            2.25            127         0              Normal
  12/28/2025 05 AM PST            2.25            127         0              Normal
  12/28/2025 06 AM PST            2.25            127         0              Normal
  12/28/2025 07 AM PST            2.24            125         -              Normal
  12/28/2025 08 AM PST            2.24            125         0              Normal
  12/28/2025 09 AM PST            2.24            125         0              Normal
  12/28/2025 10 AM PST            2.23            123         -              Normal
  12/28/2025 11 AM PST            2.23            123         0              Normal
  12/28/2025 12 PM PST            2.23            123         0              Normal
  12/28/2025 01 PM PST            2.22            121         -              Normal
  12/28/2025 02 PM PST            2.22            121         0              Normal
  12/28/2025 03 PM PST            2.22            121         0              Normal
  12/28/2025 04 PM PST            2.21            119         -              Normal
  12/28/2025 05 PM PST            2.21            119         0              Normal
  12/28/2025 06 PM PST            2.21            119         0              Normal
  12/28/2025 07 PM PST            2.21            119         0              Normal
  12/28/2025 08 PM PST            2.20            117         -              Normal
  12/28/2025 09 PM PST            2.20            117         0              Normal
  12/28/2025 10 PM PST            2.19            115         -              Normal
  12/28/2025 11 PM PST            2.19            115         0              Normal
  12/29/2025 12 AM PST            2.19            115         0              Normal
  12/29/2025 01 AM PST            2.19            115         0              Normal
  12/29/2025 02 AM PST            2.18            113         -              Normal
  12/29/2025 03 AM PST            2.18            113         0              Normal
  12/29/2025 04 AM PST            2.18            113         0              Normal
  12/29/2025 05 AM PST            2.17            111         -              Normal
  12/29/2025 06 AM PST            2.17            111         0              Normal
  12/29/2025 07 AM PST            2.17            111         0              Normal
  12/29/2025 08 AM PST            2.17            111         0              Normal
  12/29/2025 09 AM PST            2.16            109         -              Normal
  12/29/2025 10 AM PST            2.16            109         0              Normal
  12/29/2025 11 AM PST            2.16            109         0              Normal
  12/29/2025 12 PM PST            2.15            107         -              Normal
  12/29/2025 01 PM PST            2.15            107         0              Normal
  12/29/2025 02 PM PST            2.15            107         0              Normal
  12/29/2025 03 PM PST            2.14            105         -              Normal
  12/29/2025 04 PM PST            2.14            105         0              Normal
  12/29/2025 05 PM PST            2.14            105         0              Normal
  12/29/2025 06 PM PST            2.13            103         -              Normal
  12/29/2025 07 PM PST            2.13            103         0              Normal
  12/29/2025 08 PM PST            2.13            103         0              Normal
  12/29/2025 09 PM PST            2.13            103         0              Normal
  12/29/2025 10 PM PST            2.12            102         -              Normal
  12/29/2025 11 PM PST            2.12            102         0              Normal
  12/30/2025 12 AM PST            2.12            102         0              Normal
  12/30/2025 01 AM PST            2.12            102         0              Normal
  12/30/2025 02 AM PST            2.12            102         0              Normal
  12/30/2025 03 AM PST            2.12            102         0              Normal
  12/30/2025 04 AM PST            2.12            102         0              Normal
  12/30/2025 05 AM PST            2.12            102         0              Normal
  12/30/2025 06 AM PST            2.12            102         0              Normal
  12/30/2025 07 AM PST            2.12            102         0              Normal
  12/30/2025 08 AM PST            2.12            102         0              Normal
  12/30/2025 09 AM PST            2.12            102         0              Normal
  12/30/2025 10 AM PST            2.11            100         -              Normal
  12/30/2025 11 AM PST            2.11            100         0              Normal
  12/30/2025 12 PM PST            2.11            100         0              Normal
  12/30/2025 01 PM PST            2.11            100         0              Normal
  12/30/2025 02 PM PST            2.11            100         0              Normal
  12/30/2025 03 PM PST            2.11            100         0              Normal
  12/30/2025 04 PM PST            2.11            100         0              Normal
  12/30/2025 05 PM PST            2.11            100         0              Normal
  12/30/2025 06 PM PST            2.11            100         0              Normal
  12/30/2025 07 PM PST            2.11            100         0              Normal
  12/30/2025 08 PM PST            2.11            100         0              Normal
  12/30/2025 09 PM PST            2.11            100         0              Normal
  12/30/2025 10 PM PST            2.11            100         0              Normal
  12/30/2025 11 PM PST            2.11            100         0              Normal
  12/31/2025 12 AM PST            2.11            100         0              Normal
  12/31/2025 01 AM PST            2.11            100         0              Normal
  12/31/2025 02 AM PST            2.11            100         0              Normal
  12/31/2025 03 AM PST            2.11            100         0              Normal
  12/31/2025 04 AM PST            2.11            100         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.