A small USGS stream gaging station with an antenna on its roof under a cloudy evening sky

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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21 USGS gauges near your location (within 30 miles)

LAKE FORK AT GATEVIEW, CO.

USGS 09124500

Caution: High water: fish the edges; wading risky

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

Discharge: 332 ft³/s
Gauge height: 2.32 ft

Highest for this date on record 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, 7:15 PM MST	332	2.32
Nov 5, 6:15 PM MST	332	2.32
Nov 5, 5:15 PM MST	332	2.32
Nov 5, 4:15 PM MST	332	2.32
Nov 5, 3:15 PM MST	336	2.33
Nov 5, 2:15 PM MST	340	2.34
Nov 5, 1:15 PM MST	340	2.34
Nov 5, 12:15 PM MST	340	2.34
Nov 5, 11:15 AM MST	344	2.35
Nov 5, 10:15 AM MST	348	2.36
Nov 5, 9:15 AM MST	352	2.37
Nov 5, 8:15 AM MST	352	2.37
Nov 5, 7:15 AM MST	357	2.38
Nov 5, 6:15 AM MST	357	2.38
Nov 5, 5:15 AM MST	357	2.38
Nov 5, 4:15 AM MST	361	2.39
Nov 5, 3:15 AM MST	361	2.39
Nov 5, 2:15 AM MST	365	2.4
Nov 5, 1:15 AM MST	365	2.4
Nov 5, 12:15 AM MST	369	2.41
Nov 4, 11:15 PM MST	369	2.41
Nov 4, 10:15 PM MST	369	2.41
Nov 4, 9:15 PM MST	369	2.41
Nov 4, 8:15 PM MST	373	2.42
Nov 4, 7:15 PM MST	377	2.43
Nov 4, 6:15 PM MST	373	2.42
Nov 4, 5:15 PM MST	373	2.42

Reading Nov 5, 7:15 PM MST · checked 8:17 PM MST

Open full screen USGS NWS

12 miles away in a straight line

GUNNISON RIVER AT CNTY RD 32 BELOW GUNNISON, CO

USGS 383103106594200

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: 547 ft³/s
Gauge height: 5.01 ft

Steady · 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, 7:30 PM MST	547	5.01
Nov 5, 6:30 PM MST	547	5.01
Nov 5, 5:30 PM MST	558	5.03
Nov 5, 4:30 PM MST	558	5.03
Nov 5, 3:30 PM MST	564	5.04
Nov 5, 2:30 PM MST	564	5.04
Nov 5, 1:30 PM MST	575	5.06
Nov 5, 12:30 PM MST	570	5.05
Nov 5, 11:30 AM MST	587	5.08
Nov 5, 10:30 AM MST	581	5.07
Nov 5, 9:30 AM MST	592	5.09
Nov 5, 8:30 AM MST	587	5.08
Nov 5, 7:30 AM MST	581	5.07
Nov 5, 6:30 AM MST	581	5.07
Nov 5, 5:30 AM MST	570	5.05
Nov 5, 4:30 AM MST	575	5.06
Nov 5, 3:30 AM MST	570	5.05
Nov 5, 2:30 AM MST	570	5.05
Nov 5, 1:30 AM MST	564	5.04
Nov 5, 12:30 AM MST	564	5.04
Nov 4, 11:30 PM MST	564	5.04
Nov 4, 10:30 PM MST	558	5.03
Nov 4, 9:30 PM MST	558	5.03
Nov 4, 8:30 PM MST	570	5.05
Nov 4, 7:30 PM MST	570	5.05
Nov 4, 6:30 PM MST	581	5.07
Nov 4, 5:30 PM MST	581	5.07

GUNNISON RIVER AT GUNNISON WHITEWATER PARK, CO
USGS 09114520
No current reading. USGS answered but returned no recent value for this gauge (ice, maintenance or a seasonal gauge).
Open full screen USGS
14.8 miles away in a straight line

GUNNISON RIVER NEAR GUNNISON, CO.

USGS 09114500

Caution: High water: fish the edges; wading risky

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

Discharge: 449 ft³/s
Gauge height: 1.37 ft

Much above 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, 7:15 PM MST	449	1.37
Nov 5, 6:15 PM MST	449	1.37
Nov 5, 5:15 PM MST	457	1.38
Nov 5, 4:15 PM MST	449	1.37
Nov 5, 3:15 PM MST	442	1.36
Nov 5, 2:15 PM MST	413	1.32
Nov 5, 1:15 PM MST	427	1.34
Nov 5, 12:15 PM MST	420	1.33
Nov 5, 11:15 AM MST	420	1.33
Nov 5, 10:15 AM MST	457	1.38
Nov 5, 9:15 AM MST	442	1.36
Nov 5, 8:15 AM MST	435	1.35
Nov 5, 7:15 AM MST	435	1.35
Nov 5, 6:15 AM MST	427	1.34
Nov 5, 5:15 AM MST	427	1.34
Nov 5, 4:15 AM MST	442	1.36
Nov 5, 3:15 AM MST	442	1.36
Nov 5, 2:15 AM MST	435	1.35
Nov 5, 1:15 AM MST	435	1.35
Nov 5, 12:15 AM MST	427	1.34
Nov 4, 11:15 PM MST	427	1.34
Nov 4, 10:15 PM MST	427	1.34
Nov 4, 9:15 PM MST	427	1.34
Nov 4, 8:15 PM MST	449	1.37
Nov 4, 7:15 PM MST	465	1.39
Nov 4, 6:15 PM MST	472	1.4
Nov 4, 5:15 PM MST	480	1.41

TOMICHI CREEK AT GUNNISON, CO

USGS 09119000

Caution: High water: fish the edges; wading risky

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

Discharge: 186 ft³/s
Gauge height: 1.98 ft

Highest for this date on record 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, 7:30 PM MST	186	1.98
Nov 5, 6:30 PM MST	186	1.98
Nov 5, 5:30 PM MST	182	1.96
Nov 5, 4:30 PM MST	182	1.96
Nov 5, 3:30 PM MST	182	1.96
Nov 5, 2:30 PM MST	186	1.98
Nov 5, 1:30 PM MST	186	1.98
Nov 5, 12:30 PM MST	188	1.99
Nov 5, 11:30 AM MST	190	2
Nov 5, 10:30 AM MST	188	1.99
Nov 5, 9:30 AM MST	192	2.01
Nov 5, 8:30 AM MST	188	1.99
Nov 5, 7:30 AM MST	190	2
Nov 5, 6:30 AM MST	186	1.98
Nov 5, 5:30 AM MST	188	1.99
Nov 5, 4:30 AM MST	188	1.99
Nov 5, 3:30 AM MST	186	1.98
Nov 5, 2:30 AM MST	186	1.98
Nov 5, 1:30 AM MST	188	1.99
Nov 5, 12:30 AM MST	188	1.99
Nov 4, 11:30 PM MST	190	2
Nov 4, 10:30 PM MST	192	2.01
Nov 4, 9:30 PM MST	192	2.01
Nov 4, 8:30 PM MST	194	2.02
Nov 4, 7:30 PM MST	198	2.04
Nov 4, 6:30 PM MST	196	2.03
Nov 4, 5:30 PM MST	200	2.05

OHIO CREEK ABOVE MOUTH NR GUNNISON, CO

USGS 09113980

Caution: High water: fish the edges; wading risky

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

Discharge: 57.7 ft³/s
Gauge height: 2.88 ft

Highest for this date on record for Nov 5 Steady · 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, 7:00 PM MST	57.7	2.88
Nov 5, 6:00 PM MST	58.7	2.89
Nov 5, 5:00 PM MST	59.7	2.9
Nov 5, 4:00 PM MST	59.7	2.9
Nov 5, 3:00 PM MST	59.7	2.9
Nov 5, 2:00 PM MST	60.8	2.91
Nov 5, 1:00 PM MST	60.8	2.91
Nov 5, 12:00 PM MST	61.8	2.92
Nov 5, 11:00 AM MST	61.8	2.92
Nov 5, 10:00 AM MST	61.8	2.92
Nov 5, 9:00 AM MST	62.9	2.93
Nov 5, 8:00 AM MST	64	2.94
Nov 5, 7:00 AM MST	64	2.94
Nov 5, 6:00 AM MST	65.1	2.95
Nov 5, 5:00 AM MST	65.1	2.95
Nov 5, 4:00 AM MST	65.1	2.95
Nov 5, 3:00 AM MST	64	2.94
Nov 5, 2:00 AM MST	62.9	2.93
Nov 5, 1:00 AM MST	61.8	2.92
Nov 5, 12:00 AM MST	61.8	2.92
Nov 4, 11:00 PM MST	62.9	2.93
Nov 4, 10:00 PM MST	62.9	2.93
Nov 4, 9:00 PM MST	62.9	2.93
Nov 4, 8:00 PM MST	62.9	2.93
Nov 4, 7:00 PM MST	61.8	2.92
Nov 4, 6:00 PM MST	65.1	2.95
Nov 4, 5:00 PM MST	62.9	2.93

CEBOLLA CREEK NEAR POWDERHORN, CO.

USGS 09121800

Limited data: Temperature fine for trout: no flow comparison here

No flow statistics here.

Gauge height: 5.56 ft
Water temp: 40.8°F

Steady · 24 h

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)	Water temp (°F)
Nov 5, 8:00 PM MST	5.56	40.8
Nov 5, 7:00 PM MST	5.57	41.4
Nov 5, 6:00 PM MST	5.56	41.9
Nov 5, 5:00 PM MST	5.57	42.3
Nov 5, 4:00 PM MST	5.58	41.9
Nov 5, 3:00 PM MST	5.57	41.5
Nov 5, 2:00 PM MST	5.59	41.7
Nov 5, 1:00 PM MST	5.58	41
Nov 5, 12:00 PM MST	5.59	39.9
Nov 5, 11:00 AM MST	5.6	38.8
Nov 5, 10:00 AM MST	5.58	37.9
Nov 5, 9:00 AM MST	5.6	37.2
Nov 5, 8:00 AM MST	5.61	37
Nov 5, 7:00 AM MST	5.6	37
Nov 5, 6:00 AM MST	5.61	37.2
Nov 5, 5:00 AM MST	5.61	37.2
Nov 5, 4:00 AM MST	5.6	37.8
Nov 5, 3:00 AM MST	5.61	38.1
Nov 5, 2:00 AM MST	5.6	38.3
Nov 5, 1:00 AM MST	5.61	38.7
Nov 5, 12:00 AM MST	5.61	38.8
Nov 4, 11:00 PM MST	5.63	39.2
Nov 4, 10:00 PM MST	5.61	39.4
Nov 4, 9:00 PM MST	5.62	39.7
Nov 4, 8:00 PM MST	5.62	40.1
Nov 4, 7:00 PM MST	5.62	40.5
Nov 4, 6:00 PM MST	5.62	40.5

Reading Nov 5, 8:00 PM MST · checked 8:17 PM MST

CIMARRON RIVER BLW CIMARRON CREEK AT CIMARRON, CO

USGS 09127000

Caution: High water: fish the edges; wading risky

No water temperature here.

Discharge: 57.2 ft³/s
Gauge height: 8.01 ft

Much above 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, 7:15 PM MST	57.2	8.01
Nov 5, 6:15 PM MST	57.2	8.01
Nov 5, 5:15 PM MST	58.5	8.02
Nov 5, 4:15 PM MST	59.8	8.03
Nov 5, 3:15 PM MST	61.1	8.04
Nov 5, 2:15 PM MST	59.8	8.03
Nov 5, 1:15 PM MST	61.1	8.04
Nov 5, 12:15 PM MST	59.8	8.03
Nov 5, 11:15 AM MST	61.1	8.04
Nov 5, 10:15 AM MST	62.5	8.05
Nov 5, 9:15 AM MST	62.5	8.05
Nov 5, 8:15 AM MST	62.5	8.05
Nov 5, 7:15 AM MST	63.8	8.06
Nov 5, 6:15 AM MST	65.2	8.07
Nov 5, 5:15 AM MST	66.7	8.08
Nov 5, 4:15 AM MST	68.1	8.09
Nov 5, 3:15 AM MST	66.7	8.08
Nov 5, 2:15 AM MST	68.1	8.09
Nov 5, 1:15 AM MST	68.1	8.09
Nov 5, 12:15 AM MST	69.6	8.1
Nov 4, 11:15 PM MST	68.1	8.09
Nov 4, 10:15 PM MST	69.6	8.1
Nov 4, 9:15 PM MST	69.6	8.1
Nov 4, 8:15 PM MST	66.7	8.08
Nov 4, 7:15 PM MST	65.2	8.07
Nov 4, 6:15 PM MST	63.8	8.06
Nov 4, 5:15 PM MST	62.5	8.05

OHIO CREEK NEAR BALDWIN, CO.
USGS 09113500
No current reading. USGS answered but returned no recent value for this gauge (ice, maintenance or a seasonal gauge).
Open full screen USGS
19.7 miles away in a straight line

CIMARRON RIVER NEAR CIMARRON, CO

USGS 09126000

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

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

Discharge: 23 ft³/s
Gauge height: 1.24 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, 7:15 PM MST	23	1.24
Nov 5, 6:15 PM MST	23	1.24
Nov 5, 5:15 PM MST	23	1.24
Nov 5, 4:15 PM MST	23	1.24
Nov 5, 3:15 PM MST	23	1.24
Nov 5, 2:15 PM MST	23	1.24
Nov 5, 1:15 PM MST	22.2	1.23
Nov 5, 12:15 PM MST	22.2	1.23
Nov 5, 11:15 AM MST	22.2	1.23
Nov 5, 10:15 AM MST	22.2	1.23
Nov 5, 9:15 AM MST	22.2	1.23
Nov 5, 8:15 AM MST	22.2	1.23
Nov 5, 7:15 AM MST	22.2	1.23
Nov 5, 6:15 AM MST	22.2	1.23
Nov 5, 5:15 AM MST	22.2	1.23
Nov 5, 4:15 AM MST	22.2	1.23
Nov 5, 3:15 AM MST	22.2	1.23
Nov 5, 2:15 AM MST	22.2	1.23
Nov 5, 1:15 AM MST	22.2	1.23
Nov 5, 12:15 AM MST	22.2	1.23
Nov 4, 11:15 PM MST	23	1.24
Nov 4, 10:15 PM MST	23	1.24
Nov 4, 9:15 PM MST	23	1.24
Nov 4, 8:15 PM MST	23	1.24
Nov 4, 7:15 PM MST	23	1.24
Nov 4, 6:15 PM MST	23.7	1.25
Nov 4, 5:15 PM MST	23.7	1.25

EAST RIVER AT ALMONT, CO

USGS 09112500

Caution: High water: fish the edges; wading risky

The full view adds the NWS forecast.

Discharge: 166 ft³/s
Gauge height: 2.99 ft
Water temp: 44.6°F

Much above 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)	Water temp (°F)
Nov 5, 7:15 PM MST	166	2.99	44.6
Nov 5, 6:15 PM MST	166	2.99	45.1
Nov 5, 5:15 PM MST	166	2.99	45.9
Nov 5, 4:15 PM MST	166	2.99	46.4
Nov 5, 3:15 PM MST	169	3	46.6
Nov 5, 2:15 PM MST	169	3	46.4
Nov 5, 1:15 PM MST	173	3.01	45.9
Nov 5, 12:15 PM MST	173	3.01	45
Nov 5, 11:15 AM MST	173	3.01	43.3
Nov 5, 10:15 AM MST	179	3.03	42.4
Nov 5, 9:15 AM MST	176	3.02	41.9
Nov 5, 8:15 AM MST	179	3.03	41.5
Nov 5, 7:15 AM MST	179	3.03	41.7
Nov 5, 6:15 AM MST	179	3.03	41.9
Nov 5, 5:15 AM MST	179	3.03	42.1
Nov 5, 4:15 AM MST	179	3.03	42.4
Nov 5, 3:15 AM MST	176	3.02	42.8
Nov 5, 2:15 AM MST	176	3.02	43
Nov 5, 1:15 AM MST	173	3.01	43.2
Nov 5, 12:15 AM MST	169	3	43.5
Nov 4, 11:15 PM MST	169	3	43.9
Nov 4, 10:15 PM MST	169	3	44.2
Nov 4, 9:15 PM MST	169	3	44.4
Nov 4, 8:15 PM MST	166	2.99	44.8
Nov 4, 7:15 PM MST	169	3	45
Nov 4, 6:15 PM MST	169	3	45.3
Nov 4, 5:15 PM MST	169	3	45.7

TAYLOR RIVER AT ALMONT, CO.

USGS 09110000

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

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

Discharge: 130 ft³/s
Gauge height: 1.56 ft

Normal for Nov 5 Steady · 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, 7:00 PM MST	130	1.56
Nov 5, 6:00 PM MST	132	1.57
Nov 5, 5:00 PM MST	132	1.57
Nov 5, 4:00 PM MST	135	1.58
Nov 5, 3:00 PM MST	135	1.58
Nov 5, 2:00 PM MST	132	1.57
Nov 5, 1:00 PM MST	135	1.58
Nov 5, 12:00 PM MST	132	1.57
Nov 5, 11:00 AM MST	132	1.57
Nov 5, 10:00 AM MST	135	1.58
Nov 5, 9:00 AM MST	135	1.58
Nov 5, 8:00 AM MST	138	1.59
Nov 5, 7:00 AM MST	138	1.59
Nov 5, 6:00 AM MST	140	1.6
Nov 5, 5:00 AM MST	143	1.61
Nov 5, 4:00 AM MST	143	1.61
Nov 5, 3:00 AM MST	146	1.62
Nov 5, 2:00 AM MST	146	1.62
Nov 5, 1:00 AM MST	143	1.61
Nov 5, 12:00 AM MST	140	1.6
Nov 4, 11:00 PM MST	140	1.6
Nov 4, 10:00 PM MST	138	1.59
Nov 4, 9:00 PM MST	138	1.59
Nov 4, 8:00 PM MST	135	1.58
Nov 4, 7:00 PM MST	132	1.57
Nov 4, 6:00 PM MST	130	1.56
Nov 4, 5:00 PM MST	130	1.56

Checked Nov 5, 8:17 PM MST; 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.

LAKE FORK AT GATEVIEW, CO.
USGS 09124500 · CO · live flow · gauge height · water temperature · 12 mi
Reading the gauge…
GUNNISON RIVER AT CNTY RD 32 BELOW GUNNISON, CO
USGS 383103106594200 · CO · live flow · gauge height · 12.1 mi
Reading the gauge…
GUNNISON RIVER AT GUNNISON WHITEWATER PARK, CO
USGS 09114520 · CO · live flow · gauge height · 14.8 mi
Reading the gauge…
GUNNISON RIVER NEAR GUNNISON, CO.
USGS 09114500 · CO · live flow · gauge height · water temperature · 15 mi
Reading the gauge…
TOMICHI CREEK AT GUNNISON, CO
USGS 09119000 · CO · live flow · gauge height · water temperature · 15 mi
Reading the gauge…
OHIO CREEK ABOVE MOUTH NR GUNNISON, CO
USGS 09113980 · CO · live flow · gauge height · 17.1 mi
Reading the gauge…
CEBOLLA CREEK NEAR POWDERHORN, CO.
USGS 09121800 · CO · live flow · gauge height · water temperature · 18.4 mi
Reading the gauge…
CIMARRON RIVER BLW CIMARRON CREEK AT CIMARRON, CO
USGS 09127000 · CO · live flow · gauge height · water temperature · 18.7 mi
Reading the gauge…
OHIO CREEK NEAR BALDWIN, CO.
USGS 09113500 · CO · live flow · gauge height · 19.7 mi
Reading the gauge…
CIMARRON RIVER NEAR CIMARRON, CO
USGS 09126000 · CO · live flow · gauge height · 23.4 mi
Reading the gauge…
EAST RIVER AT ALMONT, CO
USGS 09112500 · CO · live flow · gauge height · water temperature · 23.8 mi
Reading the gauge…
TAYLOR RIVER AT ALMONT, CO.
USGS 09110000 · CO · live flow · gauge height · water temperature · 23.9 mi
Reading the gauge…

9 more gauges

GUNNISON RIVER BELOW GUNNISON TUNNEL, COUSGS 09128000 · CO · live flow · gauge height · 24 mi
COCHETOPA CREEK BELOW ROCK CREEK NEAR PARLIN, COUSGS 09118450 · CO · live flow · gauge height · 25.4 mi
EAST R NUMBER 1 DITCH ABV ROARING JUDY HATCHERY COUSGS 384301106505401 · CO · flow record ended · gauge height · 25.9 mi
EAST RIVER NUMBER 1 DITCH FLUME 1 ABV HWY 135, COUSGS 384611106520501 · CO · live flow · gauge height · 27.7 mi
EAST RIVER NUMBER 1 DITCH FLUME 2 ABV HWY 135, COUSGS 384609106520001 · CO · live flow · gauge height · 27.7 mi
ELK CREEK AT COAL CREEK ABV CRESTED BUTTE, COUSGS 09110990 · CO · live flow · gauge height · 27.8 mi
SLIDE DITCH FLUME BLW HWY 135 NR CRESTED BUTTE, COUSGS 384658106521901 · CO · live flow · gauge height · 28.3 mi
EAST RIVER BELOW CEMENT CREEK NR CRESTED BUTTE, COUSGS 09112200 · CO · live flow · gauge height · water temperature · 28.4 mi
SLATE R AB BAXTER GL @HWY 135 NR CRESTED BUTTE, COUSGS 385106106571000 · CO · live flow · gauge height · water temperature · 29.7 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.