Waterlands
Napa R nr St Helena Ca River
USGS · 11456000
NAPA R NR ST HELENA CA RIVER
USGS · 11456000LIVE

NAPA R NR ST HELENA CA

ST. HELENA, CA38.5113°N, -122.4558°W Updated 9 hr ago
FLOW RATE
4cfs
AIR TEMP
55°F
WIND
2mph ESE
FISH INDEX
81SCORE / 100
GREAT · 4 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 1 YEAR
4cfs NaN% vs avg
Optimal band: 2028 cfs
PERIOD HIGH
1,849cfs
PERIOD LOW
1cfs
RUNNABLE
9%
last 1 year in band
Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

17.6in

≈ normal

17.61 in of precipitation so far this year — about average for this point in the season (normal 18.42 in).

YTD Total

17.6in

This year so far

Normal to Date

18.4in

30-yr average

Typical Range

7.3–35.5in

10th–90th pct YTD

Departure

-4%

vs 30-yr normal

By Month

This year
Typical range
Normal
Jan: 4.74" · normal 5.61" (0.6–11.6)
Jan
Feb: 5.23" · normal 5.61" (0.3–10.9)
Feb
Mar: 1.21" · normal 4.14" (0.4–8.8)
Mar
Apr: 5.38" · normal 1.77" (0.5–3.9)
Apr
May: 0.91" · normal 1.04" (0.0–2.7)
May
Jun: 0.14" · normal 0.25" (0.0–0.6)
Jun
Jul: 0.00" (so far)· normal 0.02" (0.0–0.0)
Jul
Aug: normal 0.04" (0.0–0.2)
Aug
Sep: normal 0.12" (0.0–0.3)
Sep
Oct: normal 1.25" (0.0–3.4)
Oct
Nov: normal 2.85" (0.6–5.8)
Nov
Dec: normal 5.55" (0.4–11.1)
Dec
Baseline 19912020 · Source: Open-Meteo07:08 AM
Your History · NAPA R NR ST HELENA CA

Track your history

Sign in to track your sessions at NAPA R NR ST HELENA CA — best days, monthly trends, and time on the water.

Sign in
SPONSORED
Weather Conditions
WEATHER CONDITIONS
TODAY
91°
52°
SAT
91°
53°
SUN
92°
52°
MON
90°
50°
TUE
94°
50°
WED
98°
52°
THU
95°
55°
TIME
FRI
10
NOW
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
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
MON
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
TUE
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
WED
12
am
1
am
TEMP
hourly forecast
67°
mild
67°
75°
81°
86°
90°
91°
91°
90°
88°
86°
76°
69°
64°
60°
57°
55°
54°
53°
53°
53°
53°
53°
56°
61°
68°
75°
80°
84°
88°
91°
89°
88°
85°
82°
78°
68°
61°
58°
56°
54°
54°
53°
52°
52°
52°
56°
64°
71°
78°
82°
87°
90°
92°
92°
90°
88°
85°
81°
74°
62°
56°
52°
51°
51°
51°
51°
51°
50°
50°
53°
59°
67°
74°
80°
84°
87°
90°
89°
88°
85°
80°
73°
66°
56°
52°
52°
51°
51°
51°
51°
51°
51°
50°
55°
62°
70°
78°
83°
88°
92°
94°
94°
92°
90°
86°
80°
75°
70°
64°
59°
57°
55°
WIND
mph · gust · dir
3mph SSE
3
SSE
5
SSE
5
G6
SSE
6
G7
SSE
7
SSE
7
G8
W
9
G11
W
10
G11
W
9
G11
W
3
G4
SW
8
G10
SE
6
G10
SE
6
G8
SE
5
G7
ESE
4
G6
ESE
3
G4
SE
3
G4
SE
2
G3
SE
1
G3
SE
2
SE
1
G2
SE
1
G2
SE
3
SSE
4
G5
SSE
5
SSE
6
G7
SSE
7
G8
SSE
9
G10
SSE
10
G11
SSE
6
G7
SW
11
G13
W
11
G13
W
10
G13
WNW
9
G13
WNW
5
G9
NW
5
G6
SSE
4
G5
S
3
SSW
3
WSW
3
WSW
2
W
3
WSW
2
W
2
WSW
3
WSW
3
WSW
3
W
3
SW
4
SSW
5
SSW
5
SSW
7
SSW
8
SSW
10
SW
8
G9
SW
6
G8
SW
6
G7
SW
5
G6
SW
5
G6
SW
5
WSW
5
WSW
5
W
4
WSW
4
G5
WSW
4
G5
WSW
4
G5
WSW
4
W
4
W
3
G4
W
3
G4
W
3
WSW
3
SW
3
SW
4
SSW
5
SSW
6
SW
7
SW
8
SW
7
G8
SW
7
G8
WSW
7
WSW
6
WSW
5
G6
WSW
5
WSW
4
W
4
WSW
3
WSW
3
W
3
W
3
W
3
WSW
3
W
2
WNW
2
W
2
W
3
SSW
3
SSW
4
SSW
4
SSW
5
SSW
7
SW
8
SW
8
SW
7
SW
6
SW
5
SW
4
SW
4
SW
3
WSW
3
WSW
2
WSW
2
WSW
PRECIP
chance %
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
4%
4%
4%
4%
4%
4%
2%
2%
2%
2%
2%
2%
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%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
CLOUDS
cover %
6%
clear
6%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
4%
14%
88%
100%
100%
100%
100%
100%
100%
74%
24%
2%
1%
0%
0%
0%
0%
0%
0%
0%
5%
0%
15%
4%
29%
76%
7%
5%
100%
100%
100%
100%
100%
100%
100%
57%
100%
100%
100%
5%
100%
100%
38%
0%
6%
6%
5%
0%
0%
42%
62%
85%
100%
100%
100%
100%
100%
49%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
11%
27%
29%
27%
24%
20%
13%
9%
0%
0%
0%
0%
0%
5%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
PRESSURE
hPa · trend
1006
1006100510061005100710061006100510051003100510061006100410061006100610041005
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
81
Temperature
Ideal
Wind
Calm
Pressure
Stable
Moon Phase
Average
DAYLIGHT
SUNRISE
05:50 AM
SUNSET
08:37 PM
14H 47M OF DAYLIGHT11H 5M REMAINING
MOON PHASE
Waning Gibbous
88% illuminated

Station Location

38.5113, -122.4558
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-03 09:32 UTC
Site #11456000·USGS

Create a free account to save favorites, set flow alerts, and track conditions