Waterlands
Thunder Bay River
USGS · 04133501
THUNDER BAY RIVER
USGS · 04133501LIVE

THUNDER BAY RIVER AT HERRON ROAD NEAR BOLTON, MI

LONG RAPIDS TOWNSHIP, MI45.1242°N, -83.6355°W Updated 11 hr ago
FLOW RATE
520cfs
AIR TEMP
60°F
WIND
3mph SSW
FISH INDEX
88SCORE / 100
EPIC · 5 OF 5
Flow Rate Historical Avg
MEDIAN FLOW RATE · 30 DAY
520cfs 31.0% vs avg
Optimal band: 442–598 cfs
PERIOD HIGH
952cfs
PERIOD LOW
358cfs
RUNNABLE
39%
last 30 day in band
Precipitation History

Precipitation · YTD

Wet

Wetter than normal

2026 to date

23.1in

+44% vs normal

23.13 in of precipitation so far this year, 44% above the 30-year normal of 16.02 in for this point in the season.

YTD Total

23.1in

This year so far

Normal to Date

16.0in

30-yr average

Typical Range

13.1–18.4in

10th–90th pct YTD

Departure

+44%

vs 30-yr normal

By Month

This year
Typical range
Normal
Jan: 2.40" · normal 1.82" (0.9–2.7)
Jan
Feb: 2.65" · normal 1.61" (0.6–2.7)
Feb
Mar: 4.83" · normal 2.03" (0.8–3.6)
Mar
Apr: 6.35" · normal 3.18" (1.5–5.2)
Apr
May: 2.94" · normal 3.29" (1.9–4.6)
May
Jun: 3.52" · normal 3.21" (1.9–5.1)
Jun
Jul: 0.45" (so far)· normal 3.40" (1.9–5.1)
Jul
Aug: normal 3.41" (2.2–4.9)
Aug
Sep: normal 2.92" (1.7–4.0)
Sep
Oct: normal 2.75" (1.4–4.4)
Oct
Nov: normal 2.22" (1.1–3.8)
Nov
Dec: normal 1.99" (0.7–3.6)
Dec
Baseline 1991–2020 · Source: Open-Meteo09:07 AM
Your History · THUNDER BAY RIVER AT HERRON ROAD NEAR BOLTON, MI

Track your history

Sign in to track your sessions at THUNDER BAY RIVER AT HERRON ROAD NEAR BOLTON, MI — best days, monthly trends, and time on the water.

Sign in
SPONSORED
Weather Conditions
WEATHER CONDITIONS
TODAY
90°
58°
THU
76°
67°
FRI
80°
55°
SAT
83°
59°
SUN
88°
61°
MON
92°
65°
TUE
83°
70°
TIME
WED
11
NOW
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
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
TEMP
hourly forecast
83°
mild
83°
85°
87°
89°
90°
90°
86°
85°
84°
80°
74°
74°
70°
70°
69°
68°
68°
68°
67°
67°
67°
68°
70°
70°
70°
70°
71°
70°
69°
72°
74°
76°
76°
74°
71°
68°
67°
64°
62°
60°
58°
56°
56°
55°
57°
62°
66°
71°
75°
76°
78°
79°
80°
80°
79°
78°
77°
73°
67°
64°
62°
61°
61°
61°
61°
61°
60°
59°
61°
66°
70°
74°
78°
80°
82°
83°
83°
82°
80°
78°
71°
70°
68°
65°
63°
63°
62°
62°
61°
62°
62°
62°
64°
65°
66°
75°
79°
82°
84°
86°
88°
88°
87°
82°
79°
77°
74°
72°
69°
68°
67°
67°
66°
65°
66°
67°
WIND
mph · gust · dir
7mph W
G 11 mph
7
G11
W
6
G10
WSW
6
G9
SW
7
G12
SSW
7
G11
SW
8
G12
WSW
12
G15
NNW
8
G11
NNW
7
G10
NNW
11
G16
NNW
8
G18
N
4
G20
NW
6
G16
W
0
G9
E
2
G7
SSW
2
G5
SSE
2
G5
SSE
4
G5
ESE
5
G7
ESE
1
G2
S
3
G5
S
2
G6
SSW
2
G5
SE
2
G3
S
3
G5
NNW
5
G7
N
6
G7
N
6
G10
NNW
5
G9
N
5
G10
NNW
5
G9
NNW
7
G11
NW
8
G13
NW
8
G15
NW
5
G13
NNW
4
G13
NW
3
G12
WNW
4
G10
WNW
4
G8
WNW
5
G8
NW
5
NW
5
NNW
4
NNW
3
NNW
3
NW
3
G4
NNW
4
G5
N
4
G6
NE
6
G7
NNE
7
G8
NE
7
G8
NNE
8
NE
8
NE
8
ENE
8
G9
ENE
7
G8
E
5
G8
ESE
5
G11
ESE
5
E
4
ESE
1
G2
E
2
NE
2
SW
1
WNW
0
G1
E
1
G2
S
3
SSW
1
G2
SW
1
W
0
W
2
G3
ENE
3
G4
E
3
G4
ESE
3
G4
SE
4
SE
5
SE
7
SE
9
SE
10
SE
10
G12
ESE
7
G14
ESE
6
G13
SE
6
G12
SE
7
G11
SSE
6
G7
SSE
7
G10
S
6
G10
S
6
G9
S
6
G9
SSW
6
G9
SSW
6
G8
SSW
6
G7
SSW
6
G10
SSW
6
G13
SSW
5
G14
SSW
8
G13
SW
8
G12
WSW
9
G11
WSW
8
G10
WSW
7
G11
WSW
7
G11
W
9
G10
WNW
9
NNW
10
N
5
G9
NE
3
E
1
G3
ENE
2
G3
WNW
5
W
5
W
5
G6
WSW
6
G8
SW
6
G11
SW
7
G14
SW
7
G17
SW
8
G20
SW
PRECIP
chance %
1%
1%
1%
3%
3%
6%
7%
11%
15%
14%
17%
18%
16%
23%
19%
36%
30%
38%
48%
41%
45%
43%
29%
33%
32%
27%
23%
19%
27%
27%
22%
17%
13%
38%
38%
10%
10%
10%
10%
10%
10%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
3%
3%
3%
3%
3%
3%
0%
0%
0%
0%
0%
0%
1%
1%
1%
1%
1%
1%
5%
5%
5%
5%
5%
5%
16%
16%
16%
16%
16%
16%
11%
11%
11%
11%
11%
11%
14%
14%
14%
14%
CLOUDS
cover %
0%
clear
0%
64%
0%
0%
6%
3%
2%
1%
10%
97%
84%
100%
91%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
100%
92%
100%
57%
22%
0%
0%
0%
0%
0%
100%
76%
51%
98%
100%
100%
100%
100%
100%
5%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
5%
11%
6%
5%
6%
8%
100%
14%
13%
6%
7%
11%
7%
10%
5%
0%
20%
14%
13%
25%
17%
8%
8%
7%
100%
100%
100%
85%
13%
73%
5%
5%
19%
100%
100%
100%
100%
100%
100%
53%
100%
26%
11%
0%
36%
41%
11%
38%
0%
8%
5%
2%
0%
0%
0%
0%
11%
26%
37%
37%
PRESSURE
hPa · trend
991
991986987985985985985986988988990991994993994994996994994994
TemperatureWind / GustsPrecipitationCloud coverPressure
Nowscroll →
FISH INDEX
88
Temperature
Ideal
Wind
Calm
Pressure
Stable
Moon Phase
Good
DAYLIGHT
SUNRISE
05:56 AM
SUNSET
09:23 PM
15H 27M OF DAYLIGHT
MOON PHASE
Last Quarter
39% illuminated

Station Location

45.1242, -83.6355
Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-08 00:00 UTC
Site #04133501·USGS

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

Sign up free