Waterlands
San Mateo C Bl Junction Box A Dam1 nr Hillsborough River
USGS · 11162737
SAN MATEO C BL JUNCTION BOX A DAM1 NR HILLSBOROUGH RIVER
USGS · 11162737LIVE

SAN MATEO C BL JUNCTION BOX A DAM1 NR HILLSBOROUGH

SAN MATEO COUNTY, CA37.5560°N, -122.4177°W Updated 16 min ago
FLOW RATE
0.08cfs
GAUGE HT
0.46ft
AIR TEMP
55°F
WIND
14mph WNW
FISH INDEX
75SCORE / 100
GREAT · 4 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 DAY
0.08cfs 113.3% vs avg
Optimal band: 00 cfs
PERIOD HIGH
0.08cfs
PERIOD LOW
0.08cfs
RUNNABLE
0%
last 1 day in band

Gauge Height

0.46ft
Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

14.7in

≈ normal

14.73 in of precipitation so far this year — about average for this point in the season (normal 14 in).

YTD Total

14.7in

This year so far

Normal to Date

14.0in

30-yr average

Typical Range

6.6–23.6in

10th–90th pct YTD

Departure

+5%

vs 30-yr normal

By Month

This year
Typical range
Normal
Jan: 3.28" · normal 3.95" (0.8–8.5)
Jan
Feb: 5.76" · normal 4.26" (0.5–8.3)
Feb
Mar: 0.94" · normal 3.24" (0.5–6.7)
Mar
Apr: 3.84" · normal 1.64" (0.3–2.6)
Apr
May: 0.77" · normal 0.76" (0.0–1.8)
May
Jun: 0.14" · normal 0.15" (0.0–0.4)
Jun
Jul: 0.00" (so far)· normal 0.02" (0.0–0.0)
Jul
Aug: normal 0.03" (0.0–0.0)
Aug
Sep: normal 0.08" (0.0–0.2)
Sep
Oct: normal 0.93" (0.0–2.9)
Oct
Nov: normal 2.00" (0.6–3.9)
Nov
Dec: normal 3.74" (0.3–6.9)
Dec
Baseline 19912020 · Source: Open-Meteo12:01 AM
Your History · SAN MATEO C BL JUNCTION BOX A DAM1 NR HILLSBOROUGH

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Weather Conditions
WEATHER CONDITIONS
TODAY
58°
52°
WED
62°
52°
THU
69°
52°
FRI
68°
53°
SAT
75°
53°
SUN
72°
53°
MON
72°
55°
TIME
WED
12
NOW
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
THU
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
FRI
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
SAT
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
SUN
12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
TEMP
hourly forecast
53°
mild
53°
53°
52°
52°
52°
52°
52°
52°
53°
54°
55°
58°
59°
60°
61°
62°
61°
59°
58°
57°
55°
54°
53°
53°
53°
54°
54°
53°
53°
52°
52°
54°
55°
58°
63°
66°
68°
69°
66°
64°
62°
61°
58°
56°
55°
55°
55°
55°
54°
54°
53°
53°
53°
53°
53°
54°
56°
59°
63°
66°
67°
68°
68°
66°
64°
62°
60°
58°
57°
56°
56°
56°
55°
55°
54°
54°
54°
54°
53°
54°
57°
62°
67°
71°
74°
75°
74°
70°
67°
62°
62°
59°
56°
55°
55°
55°
54°
55°
55°
54°
54°
54°
53°
55°
59°
63°
67°
71°
72°
71°
70°
70°
69°
WIND
mph · gust · dir
13mph WNW
G 27 mph
13
G27
WNW
13
G26
WNW
13
G26
WNW
12
G24
WNW
12
G24
WNW
12
G23
WNW
11
G22
WNW
11
G21
WNW
10
G19
WNW
10
G18
WNW
12
G20
WNW
12
G20
WNW
13
G20
WNW
14
G22
WNW
15
G23
WNW
16
G24
WNW
17
G26
WNW
17
G27
WNW
18
G30
WNW
18
G31
WNW
19
G33
WNW
18
G34
WNW
16
G34
WNW
14
G31
WNW
13
G29
WNW
10
G26
WNW
9
G26
WNW
9
G26
WNW
7
G24
WNW
6
G23
WNW
8
G23
W
10
G21
WNW
11
G19
W
9
G12
W
7
G8
W
7
W
7
W
9
W
9
W
10
W
10
WNW
11
WNW
11
WNW
11
WNW
10
WNW
8
WNW
7
G8
WNW
6
G7
W
6
G7
WSW
5
G6
W
6
W
6
W
6
W
5
G6
W
5
WSW
5
WSW
5
WSW
6
WSW
6
WSW
7
SW
8
SW
8
SW
9
WSW
9
G10
W
10
W
10
G11
WNW
9
G10
WNW
8
G9
WNW
7
G8
W
7
W
6
G7
W
6
G7
W
6
G7
W
6
W
6
WNW
6
WNW
6
WNW
5
W
5
WSW
5
WSW
4
G5
WSW
5
SW
5
SW
5
G6
SW
6
G7
WSW
7
W
8
W
8
G9
W
10
W
9
G10
WNW
9
WNW
9
W
7
G8
W
7
W
6
W
5
W
5
G6
W
4
G7
WNW
4
G7
WSW
6
SW
5
WSW
5
SW
5
SW
3
G5
SW
5
W
3
G5
W
6
SW
5
WSW
7
SW
8
SW
8
G9
SW
8
G10
SW
8
G11
WSW
PRECIP
chance %
4%
4%
3%
3%
3%
4%
3%
2%
2%
2%
2%
2%
2%
2%
2%
3%
3%
2%
2%
2%
3%
3%
3%
3%
3%
2%
2%
3%
3%
3%
2%
4%
4%
4%
4%
4%
4%
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
2%
2%
2%
2%
2%
2%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
CLOUDS
cover %
100%
overcast
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
68%
49%
23%
19%
14%
14%
21%
22%
17%
17%
23%
28%
28%
22%
13%
10%
13%
21%
25%
40%
84%
42%
29%
22%
6%
5%
0%
0%
0%
5%
6%
55%
100%
100%
100%
100%
95%
80%
73%
78%
64%
69%
77%
100%
100%
100%
70%
12%
6%
5%
0%
0%
5%
6%
6%
43%
78%
85%
92%
97%
100%
95%
90%
86%
100%
97%
100%
100%
100%
100%
100%
100%
90%
7%
66%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
98%
96%
94%
94%
94%
PRESSURE
hPa · trend
994
994994995994993991990987987986987987988987989988988988989
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
75
Temperature
Ideal
Wind
Moderate
Pressure
Stable
Moon Phase
Good
DAYLIGHT
SUNRISE
05:55 AM
SUNSET
08:33 PM
14H 38M OF DAYLIGHT
MOON PHASE
Last Quarter
44% illuminated

Station Location

37.5560, -122.4177
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-07 23:45 UTC
Site #11162737·USGS

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