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Check a river’s flow.

Search any USGS stream gauge by river or station name, by state, or near you. Each card shows the latest flow and how it compares with the normal range for today’s date; open a gauge for the full picture: trend, water temperature and what it means for trout, safety and the official NWS flood stage.

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22 USGS gauges near your location (within 30 miles)

HARPETH RIVER NEAR KINGSTON SPRINGS, TN

USGS 03434500

Warning: Rising fast: be careful, conditions are changing

No water temperature here. The full view adds the NWS forecast.

Discharge: 2,120 ft³/s
Gauge height: 4.65 ft

Much above normal for Nov 5 Rising · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:00 PM CST	2,120	4.65
Nov 5, 8:00 PM CST	2,220	4.78
Nov 5, 7:00 PM CST	2,330	4.92
Nov 5, 6:00 PM CST	2,410	5.03
Nov 5, 5:00 PM CST	2,500	5.14
Nov 5, 4:00 PM CST	2,580	5.25
Nov 5, 3:00 PM CST	2,650	5.33
Nov 5, 2:00 PM CST	2,690	5.38
Nov 5, 1:00 PM CST	2,740	5.44
Nov 5, 12:00 PM CST	2,760	5.47
Nov 5, 11:00 AM CST	2,770	5.48
Nov 5, 10:00 AM CST	2,760	5.47
Nov 5, 9:00 AM CST	2,710	5.41
Nov 5, 8:00 AM CST	2,660	5.35
Nov 5, 7:00 AM CST	2,590	5.26
Nov 5, 6:00 AM CST	2,520	5.17
Nov 5, 5:00 AM CST	2,440	5.06
Nov 5, 4:00 AM CST	2,380	4.99
Nov 5, 3:00 AM CST	2,340	4.94
Nov 5, 2:00 AM CST	2,310	4.89
Nov 5, 1:00 AM CST	2,250	4.82
Nov 5, 12:00 AM CST	2,100	4.62
Nov 4, 11:00 PM CST	1,860	4.28
Nov 4, 10:00 PM CST	1,540	3.81
Nov 4, 9:00 PM CST	1,310	3.45
Nov 4, 8:00 PM CST	1,150	3.17
Nov 4, 7:00 PM CST	907	2.71

Reading Nov 5, 9:00 PM CST · checked 10:08 PM CST

Open full screen USGS NWS

9.8 miles away in a straight line

CUMBERLAND RIVER AT ASHLAND CITY, TN

USGS 03431790

Limited data: Not enough data: no water temperature or flow statistics here

No water temperature, flow statistics here. The full view adds the NWS forecast.

Gauge height: 17.8 ft

No flow here now. USGS stopped publishing discharge at this gauge on Oct 16, 2023; it still reports what is shown. Flow on the same river: CUMBERLAND RIVER AT NASHVILLE, TN (USGS 03431500, 18.5 miles away).

Falling · 24 h Below NWS action stage

Last 24 hours

View data as a table

Gauge height, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Gauge height (ft)
Nov 5, 9:00 PM CST	17.8
Nov 5, 8:00 PM CST	17.8
Nov 5, 7:00 PM CST	17.7
Nov 5, 6:00 PM CST	17.7
Nov 5, 5:00 PM CST	17.7
Nov 5, 4:00 PM CST	17.7
Nov 5, 3:00 PM CST	17.6
Nov 5, 2:00 PM CST	17.6
Nov 5, 1:00 PM CST	17.6
Nov 5, 12:00 PM CST	17.6
Nov 5, 11:00 AM CST	17.6
Nov 5, 10:00 AM CST	17.6
Nov 5, 9:00 AM CST	17.6
Nov 5, 8:00 AM CST	17.7
Nov 5, 7:00 AM CST	17.9
Nov 5, 6:00 AM CST	18.1
Nov 5, 5:00 AM CST	18.3
Nov 5, 4:00 AM CST	18.3
Nov 5, 3:00 AM CST	18.4
Nov 5, 2:00 AM CST	18.4
Nov 5, 1:00 AM CST	18.5
Nov 5, 12:00 AM CST	18.5
Nov 4, 11:00 PM CST	18.4
Nov 4, 10:00 PM CST	18.3
Nov 4, 9:00 PM CST	18.1
Nov 4, 8:00 PM CST	18
Nov 4, 7:00 PM CST	18

HARPETH RIVER AT BELLEVUE, TN

USGS 03433500

Caution: High water: fish the edges; wading risky

The full view adds the NWS forecast.

Discharge: 1,000 ft³/s
Gauge height: 3.13 ft
Water temp: 63.9°F

Much above normal for Nov 5 Falling · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)	Water temp (°F)
Nov 5, 9:30 PM CST	1,000	3.13	63.9
Nov 5, 8:30 PM CST	1,040	3.18	64
Nov 5, 7:30 PM CST	1,080	3.23	64.2
Nov 5, 6:30 PM CST	1,110	3.27	64.4
Nov 5, 5:30 PM CST	1,170	3.35	64.6
Nov 5, 4:30 PM CST	1,230	3.43	64.8
Nov 5, 3:30 PM CST	1,300	3.52	64.9
Nov 5, 2:30 PM CST	1,370	3.61	64.9
Nov 5, 1:30 PM CST	1,470	3.74	64.8
Nov 5, 12:30 PM CST	1,580	3.88	64.6
Nov 5, 11:30 AM CST	1,700	4.02	64.2
Nov 5, 10:30 AM CST	1,790	4.14	64
Nov 5, 9:30 AM CST	1,920	4.29	64
Nov 5, 8:30 AM CST	2,050	4.45	64
Nov 5, 7:30 AM CST	2,150	4.58	64
Nov 5, 6:30 AM CST	2,260	4.7	64.2
Nov 5, 5:30 AM CST	2,340	4.8	64.4
Nov 5, 4:30 AM CST	2,380	4.85	64.8
Nov 5, 3:30 AM CST	2,410	4.89	64.9
Nov 5, 2:30 AM CST	2,430	4.91	65.1
Nov 5, 1:30 AM CST	2,430	4.91	65.1
Nov 5, 12:30 AM CST	2,410	4.89	65.3
Nov 4, 11:30 PM CST	2,350	4.81	65.3
Nov 4, 10:30 PM CST	2,210	4.65	65.5
Nov 4, 9:30 PM CST	2,070	4.48	65.8
Nov 4, 8:30 PM CST	1,920	4.3	66
Nov 4, 7:30 PM CST	1,820	4.17	66.4

SYCAMORE CREEK NEAR ASHLAND CITY, TN

USGS 03431800

Limited data: Normal flow for the date: no water temperature here

No water temperature here. The full view adds the NWS forecast.

Discharge: 34.5 ft³/s
Gauge height: 1.88 ft

Normal for Nov 5 Steady · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:30 PM CST	34.5	1.88
Nov 5, 8:30 PM CST	35.9	1.9
Nov 5, 7:30 PM CST	36.6	1.91
Nov 5, 6:30 PM CST	38	1.93
Nov 5, 5:30 PM CST	38.8	1.94
Nov 5, 4:30 PM CST	40.2	1.96
Nov 5, 3:30 PM CST	41.7	1.98
Nov 5, 2:30 PM CST	43.3	2
Nov 5, 1:30 PM CST	44.8	2.02
Nov 5, 12:30 PM CST	46.4	2.04
Nov 5, 11:30 AM CST	48	2.06
Nov 5, 10:30 AM CST	49.6	2.08
Nov 5, 9:30 AM CST	51.3	2.1
Nov 5, 8:30 AM CST	52.1	2.11
Nov 5, 7:30 AM CST	53.8	2.13
Nov 5, 6:30 AM CST	55.5	2.15
Nov 5, 5:30 AM CST	56.4	2.16
Nov 5, 4:30 AM CST	56.4	2.16
Nov 5, 3:30 AM CST	53.8	2.13
Nov 5, 2:30 AM CST	49.6	2.08
Nov 5, 1:30 AM CST	48	2.06
Nov 5, 12:30 AM CST	47.2	2.05
Nov 4, 11:30 PM CST	41	1.97
Nov 4, 10:30 PM CST	35.9	1.9
Nov 4, 9:30 PM CST	34.5	1.88
Nov 4, 8:30 PM CST	34.5	1.88
Nov 4, 7:30 PM CST	34.5	1.88

PINEY RIVER AT VERNON, TN

USGS 03602500

Limited data: Normal flow for the date: no water temperature here

No water temperature here. The full view adds the NWS forecast.

Discharge: 79.4 ft³/s
Gauge height: 3.14 ft

Normal for Nov 5 Steady · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:15 PM CST	79.4	3.14
Nov 5, 8:15 PM CST	80.9	3.15
Nov 5, 7:15 PM CST	80.9	3.15
Nov 5, 6:15 PM CST	80.9	3.15
Nov 5, 5:15 PM CST	82.5	3.16
Nov 5, 4:15 PM CST	84	3.17
Nov 5, 3:15 PM CST	84	3.17
Nov 5, 2:15 PM CST	85.6	3.18
Nov 5, 1:15 PM CST	85.6	3.18
Nov 5, 12:15 PM CST	85.6	3.18
Nov 5, 11:15 AM CST	87.2	3.19
Nov 5, 10:15 AM CST	87.2	3.19
Nov 5, 9:15 AM CST	87.2	3.19
Nov 5, 8:15 AM CST	87.2	3.19
Nov 5, 7:15 AM CST	85.6	3.18
Nov 5, 6:15 AM CST	85.6	3.18
Nov 5, 5:15 AM CST	84	3.17
Nov 5, 4:15 AM CST	84	3.17
Nov 5, 3:15 AM CST	84	3.17
Nov 5, 2:15 AM CST	84	3.17
Nov 5, 1:15 AM CST	84	3.17
Nov 5, 12:15 AM CST	84	3.17
Nov 4, 11:15 PM CST	84	3.17
Nov 4, 10:15 PM CST	82.5	3.16
Nov 4, 9:15 PM CST	82.5	3.16
Nov 4, 8:15 PM CST	82.5	3.16
Nov 4, 7:15 PM CST	82.5	3.16

YELLOW CREEK AT ELLIS MILLS, TN

USGS 03436690

Limited data: Normal flow for the date: no water temperature here

No water temperature here.

Discharge: 41.9 ft³/s
Gauge height: 3.34 ft

Normal for Nov 5 Falling · 24 h

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:00 PM CST	41.9	3.34
Nov 5, 8:00 PM CST	43.1	3.35
Nov 5, 7:00 PM CST	43.1	3.35
Nov 5, 6:00 PM CST	43.1	3.35
Nov 5, 5:00 PM CST	44.2	3.36
Nov 5, 4:00 PM CST	45.4	3.37
Nov 5, 3:00 PM CST	46.6	3.38
Nov 5, 2:00 PM CST	46.6	3.38
Nov 5, 1:00 PM CST	47.8	3.39
Nov 5, 12:00 PM CST	47.8	3.39
Nov 5, 11:00 AM CST	49	3.4
Nov 5, 10:00 AM CST	50.2	3.41
Nov 5, 9:00 AM CST	50.2	3.41
Nov 5, 8:00 AM CST	51.5	3.42
Nov 5, 7:00 AM CST	52.7	3.43
Nov 5, 6:00 AM CST	54	3.44
Nov 5, 5:00 AM CST	54	3.44
Nov 5, 4:00 AM CST	55.3	3.45
Nov 5, 3:00 AM CST	56.7	3.46
Nov 5, 2:00 AM CST	58	3.47
Nov 5, 1:00 AM CST	59.3	3.48
Nov 5, 12:00 AM CST	60.7	3.49
Nov 4, 11:00 PM CST	62.1	3.5
Nov 4, 10:00 PM CST	59.3	3.48
Nov 4, 9:00 PM CST	58	3.47
Nov 4, 8:00 PM CST	50.2	3.41
Nov 4, 7:00 PM CST	47.8	3.39

RICHLAND CREEK AT HARDING PLACE AT BELLE MEADE, TN

USGS 03431655

Limited data: Not enough data: no water temperature or flow statistics here

No water temperature, flow statistics here. The full view adds the NWS forecast.

Discharge: 129 ft³/s
Gauge height: 2.71 ft

Falling · 24 h

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)
Nov 4, 12:45 PM CST	129
Nov 4, 11:50 AM CST	173
Nov 4, 10:55 AM CST	197
Nov 4, 5:50 AM CST	129
Nov 4, 4:55 AM CST	150
Nov 4, 4:00 AM CST	138
Nov 4, 3:50 AM CST	132

Reading Nov 4, 12:45 PM CST · checked 10:08 PM CST

Latest value is more than a day old.

Open full screen USGS

CUMBERLAND RIVER AT BRILEY PKWY AT COCKRILL BEND
USGS 03431712
No current reading. USGS answered but returned no recent value for this gauge (ice, maintenance or a seasonal gauge).
No flow at this gauge. USGS does not publish discharge here, so there are no flow statistics either; it reports what is shown. Flow on the same river: CUMBERLAND RIVER AT NASHVILLE, TN (USGS 03431500, 5.4 miles away).
Open full screen USGS NWS
23.5 miles away in a straight line
HARPETH RIVER AT MILE 81.33 NR BERRYS CHAPEL, TN
USGS 034324146
Limited data: Temperature fine for trout: no flow comparison here
No flow statistics here.
Water temp
64°F
No flow at this gauge. USGS does not publish discharge here, so there are no flow statistics either; it reports what is shown. Flow on the same river: HARPETH RIVER BELOW FRANKLIN, TN (USGS 03432400, 0.8 miles away).
Reading Nov 5, 9:00 PM CST · checked 10:08 PM CST
Open full screen USGS
23.6 miles away in a straight line

RICHLAND CREEK AT CHARLOTTE AVE, AT NASHVILLE, TN

USGS 03431700

Caution: High water: fish the edges; wading risky

No water temperature here. The full view adds the NWS forecast.

Discharge: 54.7 ft³/s
Gauge height: 1.25 ft

Much above normal for Nov 5 Falling · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:45 PM CST	54.7	1.25
Nov 5, 8:45 PM CST	55.9	1.26
Nov 5, 7:45 PM CST	55.9	1.26
Nov 5, 6:45 PM CST	58.5	1.28
Nov 5, 5:45 PM CST	59.8	1.29
Nov 5, 4:45 PM CST	59.8	1.29
Nov 5, 3:45 PM CST	63.9	1.32
Nov 5, 2:45 PM CST	65.3	1.33
Nov 5, 1:45 PM CST	66.7	1.34
Nov 5, 12:45 PM CST	69.6	1.36
Nov 5, 11:45 AM CST	71.1	1.37
Nov 5, 10:45 AM CST	75.6	1.4
Nov 5, 9:45 AM CST	80.2	1.43
Nov 5, 8:45 AM CST	81.7	1.44
Nov 5, 7:45 AM CST	84.6	1.46
Nov 5, 6:45 AM CST	87.7	1.48
Nov 5, 5:45 AM CST	92.3	1.51
Nov 5, 4:45 AM CST	93.9	1.52
Nov 5, 3:45 AM CST	98.8	1.55
Nov 5, 2:45 AM CST	104	1.58
Nov 5, 1:45 AM CST	109	1.61
Nov 5, 12:45 AM CST	116	1.65
Nov 4, 11:45 PM CST	122	1.68
Nov 4, 10:45 PM CST	129	1.72
Nov 4, 9:45 PM CST	137	1.77
Nov 4, 8:45 PM CST	146	1.82
Nov 4, 7:45 PM CST	156	1.88

DUCK RIVER AT HWY 100 AT CENTERVILLE, TN

USGS 03601990

Warning: Rising fast: be careful, conditions are changing

No water temperature here. The full view adds the NWS forecast.

Discharge: 4,150 ft³/s
Gauge height: 7.61 ft

Much above normal for Nov 5 Rising · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:00 PM CST	4,150	7.61
Nov 5, 8:00 PM CST	4,170	7.63
Nov 5, 7:00 PM CST	4,180	7.64
Nov 5, 6:00 PM CST	4,160	7.62
Nov 5, 5:00 PM CST	4,170	7.63
Nov 5, 4:00 PM CST	4,130	7.6
Nov 5, 3:00 PM CST	4,090	7.56
Nov 5, 2:00 PM CST	4,010	7.5
Nov 5, 1:00 PM CST	3,910	7.41
Nov 5, 12:00 PM CST	3,760	7.29
Nov 5, 11:00 AM CST	3,580	7.13
Nov 5, 10:00 AM CST	3,370	6.94
Nov 5, 9:00 AM CST	3,130	6.72
Nov 5, 8:00 AM CST	2,890	6.49
Nov 5, 7:00 AM CST	2,650	6.24
Nov 5, 6:00 AM CST	2,420	5.99
Nov 5, 5:00 AM CST	2,180	5.73
Nov 5, 4:00 AM CST	1,920	5.43
Nov 5, 3:00 AM CST	1,600	5.04
Nov 5, 2:00 AM CST	1,290	4.62
Nov 5, 1:00 AM CST	1,010	4.2
Nov 5, 12:00 AM CST	837	3.89
Nov 4, 11:00 PM CST	756	3.74
Nov 4, 10:00 PM CST	725	3.68
Nov 4, 9:00 PM CST	710	3.65
Nov 4, 8:00 PM CST	705	3.64
Nov 4, 7:00 PM CST	700	3.63

HARPETH RIVER BELOW FRANKLIN, TN

USGS 03432400

Caution: High water: fish the edges; wading risky

No water temperature here. The full view adds the NWS forecast.

Discharge: 442 ft³/s
Gauge height: 5.28 ft

Much above normal for Nov 5 Falling · 24 h Below NWS action stage

Last 24 hours

View data as a table

Discharge, last 7 days: readings, about hourly, newest first. USGS provisional data may be revised.
Time	Discharge (ft³/s)	Gauge height (ft)
Nov 5, 9:00 PM CST	442	5.28
Nov 5, 8:00 PM CST	459	5.37
Nov 5, 7:00 PM CST	477	5.46
Nov 5, 6:00 PM CST	497	5.56
Nov 5, 5:00 PM CST	521	5.68
Nov 5, 4:00 PM CST	546	5.8
Nov 5, 3:00 PM CST	573	5.93
Nov 5, 2:00 PM CST	606	6.08
Nov 5, 1:00 PM CST	630	6.18
Nov 5, 12:00 PM CST	666	6.33
Nov 5, 11:00 AM CST	705	6.49
Nov 5, 10:00 AM CST	746	6.65
Nov 5, 9:00 AM CST	801	6.86
Nov 5, 8:00 AM CST	852	7.05
Nov 5, 7:00 AM CST	920	7.31
Nov 5, 6:00 AM CST	997	7.59
Nov 5, 5:00 AM CST	1,090	7.9
Nov 5, 4:00 AM CST	1,190	8.24
Nov 5, 3:00 AM CST	1,290	8.55
Nov 5, 2:00 AM CST	1,400	8.89
Nov 5, 1:00 AM CST	1,490	9.16
Nov 5, 12:00 AM CST	1,560	9.38
Nov 4, 11:00 PM CST	1,600	9.5
Nov 4, 10:00 PM CST	1,600	9.52
Nov 4, 9:00 PM CST	1,580	9.45
Nov 4, 8:00 PM CST	1,530	9.29
Nov 4, 7:00 PM CST	1,480	9.14

Checked Nov 5, 10:08 PM CST; readings refresh at most every 15 minutes and statistics daily. Provisional USGS data can be revised. Conditions change: re-check before you go. This is general guidance, not a fishing forecast, a safety guarantee or a statement about access.

HARPETH RIVER NEAR KINGSTON SPRINGS, TN
USGS 03434500 · TN · live flow · gauge height · 9.8 mi
Reading the gauge…
CUMBERLAND RIVER AT ASHLAND CITY, TN
USGS 03431790 · TN · flow record ended · gauge height · 16.1 mi
Reading the gauge…
HARPETH RIVER AT BELLEVUE, TN
USGS 03433500 · TN · live flow · gauge height · water temperature · 19.5 mi
Reading the gauge…
SYCAMORE CREEK NEAR ASHLAND CITY, TN
USGS 03431800 · TN · live flow · gauge height · 19.6 mi
Reading the gauge…
PINEY RIVER AT VERNON, TN
USGS 03602500 · TN · live flow · gauge height · 20.3 mi
Reading the gauge…
YELLOW CREEK AT ELLIS MILLS, TN
USGS 03436690 · TN · live flow · gauge height · 21.4 mi
Reading the gauge…
RICHLAND CREEK AT HARDING PLACE AT BELLE MEADE, TN
USGS 03431655 · TN · live flow · gauge height · 22.6 mi
Reading the gauge…
CUMBERLAND RIVER AT BRILEY PKWY AT COCKRILL BEND
USGS 03431712 · TN · no flow · gauge height · 23.5 mi
Reading the gauge…
HARPETH RIVER AT MILE 81.33 NR BERRYS CHAPEL, TN
USGS 034324146 · TN · no flow · water temperature · 23.6 mi
Reading the gauge…
RICHLAND CREEK AT CHARLOTTE AVE, AT NASHVILLE, TN
USGS 03431700 · TN · live flow · gauge height · 23.6 mi
Reading the gauge…
DUCK RIVER AT HWY 100 AT CENTERVILLE, TN
USGS 03601990 · TN · live flow · gauge height · 24.2 mi
Reading the gauge…
HARPETH RIVER BELOW FRANKLIN, TN
USGS 03432400 · TN · live flow · gauge height · 24.3 mi
Reading the gauge…

10 more gauges

CUMBERLAND RIVER NEAR BORDEAUX, TNUSGS 03431514 · TN · no flow · gauge height · water temperature · 25.6 mi
HARPETH RIVER AT FRANKLIN, TNUSGS 03432350 · TN · live flow · gauge height · 25.9 mi
DUCK RIVER NEAR SHADY GROVE, TN.USGS 03601600 · TN · live flow · gauge height · 26.2 mi
WHITES CREEK NEAR BORDEAUX, TNUSGS 03431599 · TN · live flow · gauge height · 26.5 mi
W F BROWNS C AT GLENDALE LANE AT NASHVILLE, TNUSGS 03431100 · TN · live flow · gauge height · 26.8 mi
HARPETH RIVER AT MILE 90.5 NEAR FRANKLIN, TNUSGS 0343233905 · TN · live flow · gauge height · water temperature · 27.8 mi
WHITES C AT OLD HICKORY BLVD AT WHITES CREEK, TNUSGS 03431530 · TN · live flow · gauge height · 28.1 mi
CUMBERLAND RIVER AT NASHVILLE, TNUSGS 03431500 · TN · live flow · gauge height · 28.2 mi
BROWNS CREEK AT STATE FAIRGROUNDS AT NASHVILLE, TNUSGS 03431300 · TN · live flow · gauge height · 28.7 mi
DUCK RIVER ABOVE HURRICANE MILLS, TNUSGS 03603000 · TN · live flow · gauge height · 28.8 mi

Quick picks: our 2,852 waters by state

Each state opens its USGS gauges and our water pages there; a water opens the live cards for its gauges, or the NOAA tides for flats and surf.

Search covers 11,178 USGS stream gauges that reported discharge, gauge height or water temperature in the 183 days before 2026-10-23 (USGS series catalog); readings are fetched live when a gauge is shown.

Where these numbers come from

Discharge, gauge height, water temperature and water quality: U.S. Geological Survey readings (provisional, can be revised), cached for 15 minutes. Where USGS publishes a gauge’s flow only once a day, the latest daily mean is shown with its date.
Normal range: the 25th to 75th percentile of daily mean flow for the same calendar day over the gauge’s record (USGS daily statistics), classed as USGS does (hyswap).
Temperature guidance for trout quotes the gauge’s own state fish and wildlife agency; where we found none, it says so and quotes federal guidance (National Park Service, U.S. Fish and Wildlife Service). Cold-water safety quotes the NWS; dissolved oxygen and pH are read against EPA criteria. Each line names its source.
Flood stage and forecasts: the National Weather Service’s National Water Prediction Service and its Turn Around Don’t Drown guidance. Tides: NOAA Tides & Currents.

General guidance, not a fishing forecast, a safety guarantee or a statement about access. Planning a trip? The trip planner shows these readings on every day you fish a water.