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GUADALUPE RIVER - SAN JOSE AT ALMADEN EXPRESSWAY (GUDC1)
| Latitude: 37.28º N | Longitude: 121.88º W | Elevation: 150 Feet | | Forecast Type: Official Location |
| Location: Santa Clara County in California | Bulletin Group: Central Coast | River Group: South Bay |
| Issuance Time: | Apr 21 2026 at 1:50 PM PDT | Next Issuance: | Apr 22 2026 at 9:00 AM PDT
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| Action/Monitor: 9.0 Feet | Minor Flood: 10.5 Feet | Moderate Flood: 11.5 Feet | Major Flood: 15.0 Feet |
# Tabular Observed and Forecast Hydrograph Information
#
# Location: Guadalupe River - San Jose at Almaden Exprwy (GUDC1)
#
# File Generation Time: 04/21/2026 at 01:51 PM PDT
# Data Interval: 1 Hour
#
# Most Recent Date & Time of Maximum Observed: 04/21/2026 at 04:00 AM PDT
# Maximum Observed Stage: 2.96 Feet
# Maximum Observed Flow: 200 cfs
#
# Earliest Date & Time of Maximum Forecast: 04/21/2026 at 03:00 PM PDT
# Maximum Forecast Stage: 2.33 Feet
# Maximum Forecast Flow: 81 cfs
#
# OBSERVED
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Observed Status
# ---------------------------------------------------------------------------------
04/16/2026 01 PM PDT 1.71 24 Normal
04/16/2026 02 PM PDT 1.71 24 0 Normal
04/16/2026 03 PM PDT 1.71 24 0 Normal
04/16/2026 04 PM PDT 1.71 24 0 Normal
04/16/2026 05 PM PDT 1.72 25 + Normal
04/16/2026 06 PM PDT 1.72 25 0 Normal
04/16/2026 07 PM PDT 1.72 25 0 Normal
04/16/2026 08 PM PDT 1.72 25 0 Normal
04/16/2026 09 PM PDT 1.72 25 0 Normal
04/16/2026 10 PM PDT 1.72 25 0 Normal
04/16/2026 11 PM PDT 1.72 25 0 Normal
04/17/2026 12 AM PDT 1.72 25 0 Normal
04/17/2026 01 AM PDT 1.72 25 0 Normal
04/17/2026 02 AM PDT 1.72 25 0 Normal
04/17/2026 03 AM PDT 1.72 25 0 Normal
04/17/2026 04 AM PDT 1.72 25 0 Normal
04/17/2026 05 AM PDT 1.72 25 0 Normal
04/17/2026 06 AM PDT 1.73 25 + Normal
04/17/2026 07 AM PDT 1.73 25 0 Normal
04/17/2026 08 AM PDT 1.73 25 0 Normal
04/17/2026 09 AM PDT 1.73 25 0 Normal
04/17/2026 10 AM PDT 1.73 25 0 Normal
04/17/2026 11 AM PDT 1.73 25 0 Normal
04/17/2026 12 PM PDT 1.73 25 0 Normal
04/17/2026 01 PM PDT 1.73 25 0 Normal
04/17/2026 02 PM PDT 1.73 25 0 Normal
04/17/2026 03 PM PDT 1.73 25 0 Normal
04/17/2026 04 PM PDT 1.73 25 0 Normal
04/17/2026 05 PM PDT 1.73 25 0 Normal
04/17/2026 06 PM PDT 1.73 25 0 Normal
04/17/2026 07 PM PDT 1.72 25 - Normal
04/17/2026 08 PM PDT 1.72 25 0 Normal
04/17/2026 09 PM PDT 1.72 25 0 Normal
04/17/2026 10 PM PDT 1.72 25 0 Normal
04/17/2026 11 PM PDT 1.72 25 0 Normal
04/18/2026 12 AM PDT 1.72 25 0 Normal
04/18/2026 01 AM PDT 1.72 25 0 Normal
04/18/2026 02 AM PDT 1.72 25 0 Normal
04/18/2026 03 AM PDT 1.73 25 + Normal
04/18/2026 04 AM PDT 1.73 25 0 Normal
04/18/2026 05 AM PDT 1.73 25 0 Normal
04/18/2026 06 AM PDT 1.73 25 0 Normal
04/18/2026 07 AM PDT 1.73 25 0 Normal
04/18/2026 08 AM PDT 1.73 25 0 Normal
04/18/2026 09 AM PDT 1.74 26 + Normal
04/18/2026 10 AM PDT 1.74 26 0 Normal
04/18/2026 11 AM PDT 1.74 26 0 Normal
04/18/2026 12 PM PDT 1.74 26 0 Normal
04/18/2026 01 PM PDT 1.74 26 0 Normal
04/18/2026 02 PM PDT 1.74 26 0 Normal
04/18/2026 03 PM PDT 1.74 26 0 Normal
04/18/2026 04 PM PDT 1.74 26 0 Normal
04/18/2026 05 PM PDT 1.74 26 0 Normal
04/18/2026 06 PM PDT 1.74 26 0 Normal
04/18/2026 07 PM PDT 1.74 26 0 Normal
04/18/2026 08 PM PDT 1.74 26 0 Normal
04/18/2026 09 PM PDT 1.74 26 0 Normal
04/18/2026 10 PM PDT 1.73 25 - Normal
04/18/2026 11 PM PDT 1.73 25 0 Normal
04/19/2026 12 AM PDT 1.73 25 0 Normal
04/19/2026 01 AM PDT 1.73 25 0 Normal
04/19/2026 02 AM PDT 1.74 26 + Normal
04/19/2026 03 AM PDT 1.74 26 0 Normal
04/19/2026 04 AM PDT 1.74 26 0 Normal
04/19/2026 05 AM PDT 1.74 26 0 Normal
04/19/2026 06 AM PDT 1.78 29 + Normal
04/19/2026 07 AM PDT 1.80 30 + Normal
04/19/2026 08 AM PDT 1.80 30 0 Normal
04/19/2026 09 AM PDT 1.77 28 - Normal
04/19/2026 10 AM PDT 1.80 30 + Normal
04/19/2026 11 AM PDT 1.78 29 - Normal
04/19/2026 12 PM PDT 1.77 28 - Normal
04/19/2026 01 PM PDT 1.78 29 + Normal
04/19/2026 02 PM PDT 1.77 28 - Normal
04/19/2026 03 PM PDT 1.77 28 0 Normal
04/19/2026 04 PM PDT 1.77 28 0 Normal
04/19/2026 05 PM PDT 1.77 28 0 Normal
04/19/2026 06 PM PDT 1.79 29 + Normal
04/19/2026 07 PM PDT 1.78 29 - Normal
04/19/2026 08 PM PDT 1.77 28 - Normal
04/19/2026 09 PM PDT 1.76 27 - Normal
04/19/2026 10 PM PDT 1.74 26 - Normal
04/19/2026 11 PM PDT 1.74 26 0 Normal
04/20/2026 12 AM PDT 1.73 25 - Normal
04/20/2026 01 AM PDT 1.73 25 0 Normal
04/20/2026 02 AM PDT 1.73 25 0 Normal
04/20/2026 03 AM PDT 1.74 26 + Normal
04/20/2026 04 AM PDT 1.73 25 - Normal
04/20/2026 05 AM PDT 1.75 27 + Normal
04/20/2026 06 AM PDT 1.74 26 - Normal
04/20/2026 07 AM PDT 1.74 26 0 Normal
04/20/2026 08 AM PDT 1.74 26 0 Normal
04/20/2026 09 AM PDT 1.74 26 0 Normal
04/20/2026 10 AM PDT 1.74 26 0 Normal
04/20/2026 11 AM PDT 1.75 27 + Normal
04/20/2026 12 PM PDT 1.75 27 0 Normal
04/20/2026 01 PM PDT 1.75 27 0 Normal
04/20/2026 02 PM PDT 1.75 27 0 Normal
04/20/2026 03 PM PDT 1.75 27 0 Normal
04/20/2026 04 PM PDT 1.75 27 0 Normal
04/20/2026 05 PM PDT 1.75 27 0 Normal
04/20/2026 06 PM PDT 1.74 26 - Normal
04/20/2026 07 PM PDT 1.75 27 + Normal
04/20/2026 08 PM PDT 1.75 27 0 Normal
04/20/2026 09 PM PDT 1.75 27 0 Normal
04/20/2026 10 PM PDT 1.77 28 + Normal
04/20/2026 11 PM PDT 2.35 83 + Normal
04/21/2026 12 AM PDT 2.88 181 + Normal
04/21/2026 01 AM PDT 2.66 133 - Normal
04/21/2026 02 AM PDT 2.39 88 - Normal
04/21/2026 03 AM PDT 2.41 91 + Normal
04/21/2026 04 AM PDT 2.96 200 + Normal
04/21/2026 05 AM PDT 2.92 190 - Normal
04/21/2026 06 AM PDT 2.35 83 - Normal
04/21/2026 07 AM PDT 2.21 67 - Normal
04/21/2026 08 AM PDT 2.15 60 - Normal
04/21/2026 09 AM PDT 2.11 56 - Normal
04/21/2026 10 AM PDT 2.04 49 - Normal
04/21/2026 11 AM PDT 2.01 46 - Normal
04/21/2026 12 PM PDT 2.11 56 + Normal
04/21/2026 01 PM PDT 2.15 60 + Normal
#
# FORECAST
#
# Date & Time (Local) Stage (Feet) Flow (cfs) Trend Forecast Status
# ---------------------------------------------------------------------------------
04/21/2026 02 PM PDT 2.20 65 Normal
04/21/2026 03 PM PDT 2.33 81 + Normal
04/21/2026 04 PM PDT 2.33 81 0 Normal
04/21/2026 05 PM PDT 2.18 63 - Normal
04/21/2026 06 PM PDT 2.08 53 - Normal
04/21/2026 07 PM PDT 2.03 48 - Normal
04/21/2026 08 PM PDT 1.99 45 - Normal
04/21/2026 09 PM PDT 1.93 40 - Normal
04/21/2026 10 PM PDT 1.88 36 - Normal
04/21/2026 11 PM PDT 1.83 32 - Normal
04/22/2026 12 AM PDT 1.80 30 - Normal
04/22/2026 01 AM PDT 1.77 28 - Normal
04/22/2026 02 AM PDT 1.75 27 - Normal
04/22/2026 03 AM PDT 1.73 25 - Normal
04/22/2026 04 AM PDT 1.72 25 - Normal
04/22/2026 05 AM PDT 1.73 25 + Normal
04/22/2026 06 AM PDT 1.80 30 + Normal
04/22/2026 07 AM PDT 1.88 36 + Normal
04/22/2026 08 AM PDT 1.89 37 + Normal
04/22/2026 09 AM PDT 1.83 32 - Normal
04/22/2026 10 AM PDT 1.76 27 - Normal
04/22/2026 11 AM PDT 1.71 24 - Normal
04/22/2026 12 PM PDT 1.71 24 0 Normal
04/22/2026 01 PM PDT 1.75 27 + Normal
04/22/2026 02 PM PDT 1.79 29 + Normal
04/22/2026 03 PM PDT 1.82 32 + Normal
04/22/2026 04 PM PDT 1.83 32 + Normal
04/22/2026 05 PM PDT 1.79 29 - Normal
04/22/2026 06 PM PDT 1.74 26 - Normal
04/22/2026 07 PM PDT 1.71 24 - Normal
04/22/2026 08 PM PDT 1.69 23 - Normal
04/22/2026 09 PM PDT 1.68 22 - Normal
04/22/2026 10 PM PDT 1.67 21 - Normal
04/22/2026 11 PM PDT 1.66 21 - Normal
04/23/2026 12 AM PDT 1.65 20 - Normal
04/23/2026 01 AM PDT 1.64 20 - Normal
04/23/2026 02 AM PDT 1.64 20 0 Normal
04/23/2026 03 AM PDT 1.63 19 - Normal
04/23/2026 04 AM PDT 1.63 19 0 Normal
04/23/2026 05 AM PDT 1.62 18 - Normal
04/23/2026 06 AM PDT 1.62 18 0 Normal
04/23/2026 07 AM PDT 1.61 18 - Normal
04/23/2026 08 AM PDT 1.61 18 0 Normal
04/23/2026 09 AM PDT 1.61 18 0 Normal
04/23/2026 10 AM PDT 1.60 17 - Normal
04/23/2026 11 AM PDT 1.60 17 0 Normal
04/23/2026 12 PM PDT 1.60 17 0 Normal
04/23/2026 01 PM PDT 1.60 17 0 Normal
04/23/2026 02 PM PDT 1.59 17 - Normal
04/23/2026 03 PM PDT 1.59 17 0 Normal
04/23/2026 04 PM PDT 1.59 17 0 Normal
04/23/2026 05 PM PDT 1.59 17 0 Normal
04/23/2026 06 PM PDT 1.58 16 - Normal
04/23/2026 07 PM PDT 1.58 16 0 Normal
04/23/2026 08 PM PDT 1.58 16 0 Normal
04/23/2026 09 PM PDT 1.58 16 0 Normal
04/23/2026 10 PM PDT 1.58 16 0 Normal
04/23/2026 11 PM PDT 1.57 16 - Normal
04/24/2026 12 AM PDT 1.57 16 0 Normal
04/24/2026 01 AM PDT 1.57 16 0 Normal
04/24/2026 02 AM PDT 1.57 16 0 Normal
04/24/2026 03 AM PDT 1.57 16 0 Normal
04/24/2026 04 AM PDT 1.57 16 0 Normal
04/24/2026 05 AM PDT 1.57 16 0 Normal
04/24/2026 06 AM PDT 1.57 16 0 Normal
04/24/2026 07 AM PDT 1.57 16 0 Normal
04/24/2026 08 AM PDT 1.56 15 - Normal
04/24/2026 09 AM PDT 1.56 15 0 Normal
04/24/2026 10 AM PDT 1.56 15 0 Normal
04/24/2026 11 AM PDT 1.56 15 0 Normal
04/24/2026 12 PM PDT 1.56 15 0 Normal
04/24/2026 01 PM PDT 1.56 15 0 Normal
04/24/2026 02 PM PDT 1.56 15 0 Normal
04/24/2026 03 PM PDT 1.56 15 0 Normal
04/24/2026 04 PM PDT 1.56 15 0 Normal
04/24/2026 05 PM PDT 1.56 15 0 Normal
04/24/2026 06 PM PDT 1.55 15 - Normal
04/24/2026 07 PM PDT 1.55 15 0 Normal
04/24/2026 08 PM PDT 1.55 15 0 Normal
04/24/2026 09 PM PDT 1.55 15 0 Normal
04/24/2026 10 PM PDT 1.55 15 0 Normal
04/24/2026 11 PM PDT 1.55 15 0 Normal
04/25/2026 12 AM PDT 1.55 15 0 Normal
04/25/2026 01 AM PDT 1.55 15 0 Normal
04/25/2026 02 AM PDT 1.55 15 0 Normal
04/25/2026 03 AM PDT 1.55 15 0 Normal
04/25/2026 04 AM PDT 1.55 15 0 Normal
04/25/2026 05 AM PDT 1.55 15 0 Normal
04/25/2026 06 AM PDT 1.55 15 0 Normal
04/25/2026 07 AM PDT 1.55 15 0 Normal
04/25/2026 08 AM PDT 1.55 15 0 Normal
04/25/2026 09 AM PDT 1.55 15 0 Normal
04/25/2026 10 AM PDT 1.55 15 0 Normal
04/25/2026 11 AM PDT 1.55 15 0 Normal
04/25/2026 12 PM PDT 1.55 15 0 Normal
04/25/2026 01 PM PDT 1.55 15 0 Normal
04/25/2026 02 PM PDT 1.55 15 0 Normal
04/25/2026 03 PM PDT 1.55 15 0 Normal
04/25/2026 04 PM PDT 1.54 14 - Normal
04/25/2026 05 PM PDT 1.54 14 0 Normal
04/25/2026 06 PM PDT 1.54 14 0 Normal
04/25/2026 07 PM PDT 1.54 14 0 Normal
04/25/2026 08 PM PDT 1.54 14 0 Normal
04/25/2026 09 PM PDT 1.54 14 0 Normal
04/25/2026 10 PM PDT 1.54 14 0 Normal
04/25/2026 11 PM PDT 1.54 14 0 Normal
04/26/2026 12 AM PDT 1.54 14 0 Normal
04/26/2026 01 AM PDT 1.53 13 - Normal
04/26/2026 02 AM PDT 1.53 13 0 Normal
04/26/2026 03 AM PDT 1.53 13 0 Normal
04/26/2026 04 AM PDT 1.53 13 0 Normal
04/26/2026 05 AM PDT 1.53 13 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.
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