Kentucky River Levels & Streamflow
As of Aug 3, 2026, Kentucky rivers are running at 77% of normal across 115 USGS gauges — the highest is 73,500 cfs on the Ohio River At Old Shawneetown. Live discharge, gauge height, and percent-of-normal for every USGS streamgauge in Kentucky.
Streamflow levels across Kentucky are currently 77% of normal, with the Ohio River At Old Shawneetown reporting the highest discharge in the state at 73,500 cfs and a gauge stage of 15.79 ft.
Meanwhile, the Brashears Creek At Taylorsville is seeing a spike today — up 2362% since yesterday and currently running near peak.
Tap any gauge below for the full hydrograph, paired weather forecast, and historical context. Use the rivers panel to jump into Kentucky's named rivers.
State-wide streamflow overview
The Kentucky flow picture in four data points -- where the state sits versus historical norms, what's flowing hardest, and what's spiking fastest.
Percent of normal
100% is the historical norm. Below 70% indicates drought; above 130% can flag elevated flood risk.
Highest discharge
Gauge stage 15.79 ft
Biggest 24h spike
Now 1,960 cfs
Network coverage
USGS gauges feeding 0 named rivers in Kentucky.
Kentucky USGS streamgauges
Every USGS gauge Snoflo tracks in Kentucky. Sortable, quickly filterable. Numeric columns heat-mapped from light to deep. Tap any gauge for its full hydrograph and forecast.
| Streamgage | Streamflow | Gage height | Water temp | Air temp | Elevation | Watershed |
|---|---|---|---|---|---|---|
|
Ohio River At Old Shawneetown, Ky
1 day ago · USGS 03381700 |
73,500 cfs | 16.29 ft | · | 63°F | 334 ft | Lower Ohio-Bay |
|
Ohio River At Cannelton Dam At Cannelton, Ky
6 hours ago · USGS 03303280 |
52,600 cfs | 12.30 ft | 72°F | 65°F | 391 ft | Lower Ohio-Little Pigeon |
|
Ohio River At Greenup Dam Near Greenup, Ky
6 hours ago · USGS 03216600 |
40,300 cfs | 15.72 ft | · | 68°F | 513 ft | Little Scioto-Tygarts |
|
Ohio River At Markland Dam Near Warsaw, Ky
6 hours ago · USGS 03277200 |
35,200 cfs | 14.80 ft | 83°F | 64°F | 454 ft | Middle Ohio-Laughery |
|
Green River At Lock 2 At Calhoun, Ky
5 hours ago · USGS 03320000 |
4,270 cfs | 11.25 ft | · | 66°F | 386 ft | Lower Green |
|
Kentucky River At Lock 7 At Highbridge, Ky
5 days ago · USGS 03286500 |
3,540 cfs | 10.55 ft | · | 65°F | 548 ft | Lower Kentucky |
|
Green River At Paradise, Ky
5 hours ago · USGS 03316500 |
3,390 cfs | 2.55 ft | · | 65°F | 395 ft | Middle Green |
|
Kentucky River At Lock 2 At Lockport, Ky
4 hours ago · USGS 03290500 |
2,890 cfs | 9.70 ft | 77°F | 65°F | 463 ft | Lower Kentucky |
|
Kentucky River At Lock 3 At Gest, Ky
4 hours ago · USGS 03290080 |
2,780 cfs | 8.68 ft | · | 65°F | 473 ft | Lower Kentucky |
|
Kentucky River At Lock 4 At Frankfort, Ky
4 hours ago · USGS 03287500 |
2,170 cfs | 7.67 ft | 79°F | 66°F | 499 ft | Lower Kentucky |
|
Kentucky River At Lock 6 Near Salvisa, Ky
4 hours ago · USGS 03287000 |
2,160 cfs | 10.88 ft | · | 66°F | 555 ft | Lower Kentucky |
|
Kentucky River At Lock 5 Near Tyrone, Ky
4 hours ago · USGS 03287250 |
2,070 cfs | 9.97 ft | · | 66°F | 504 ft | Lower Kentucky |
|
Salt River At Shepherdsville, Ky
4 hours ago · USGS 03298500 |
1,900 cfs | 3.37 ft | · | 67°F | 408 ft | Salt |
|
Kentucky River At Lock 8 Near Camp Nelson, Ky
4 hours ago · USGS 03284500 |
1,820 cfs | 12.82 ft | · | 66°F | 586 ft | Lower Kentucky |
|
Kentucky River At Lock 9 At Valley View, Ky
5 hours ago · USGS 03284230 |
1,580 cfs | 11.90 ft | · | 66°F | 591 ft | Lower Kentucky |
|
Kentucky River At Lock 10 Near Winchester, Ky
4 hours ago · USGS 03284000 |
1,500 cfs | 10.85 ft | · | 66°F | 604 ft | Lower Kentucky |
|
Kentucky River At Lock 11 Near College Hill, Ky
4 hours ago · USGS 03282290 |
1,390 cfs | 11.92 ft | · | 66°F | 597 ft | Upper Kentucky |
|
Cumberland River At Williamsburg, Ky
4 hours ago · USGS 03404000 |
1,340 cfs | 4.68 ft | · | 70°F | 915 ft | Upper Cumberland |
|
Cumberland River At Cumberland Falls, Ky
4 hours ago · USGS 03404500 |
1,050 cfs | 2.25 ft | · | 67°F | 835 ft | Upper Cumberland |
|
Green River At Munfordville, Ky
5 hours ago · USGS 03308500 |
844 cfs | 3.71 ft | 63°F | 66°F | 553 ft | Upper Green |
|
Rockcastle River At Billows, Ky
4 hours ago · USGS 03406500 |
817 cfs | 4.13 ft | · | 66°F | 888 ft | Rockcastle |
|
Kentucky River At Lock 14 At Heidelberg, Ky
5 hours ago · USGS 03282000 |
683 cfs | 9.57 ft | · | 64°F | 630 ft | Upper Kentucky |
|
Elkhorn Creek Near Frankfort, Ky
4 hours ago · USGS 03289500 |
658 cfs | 3.54 ft | 77°F | 65°F | 559 ft | Lower Kentucky |
|
Clear Fork At Saxton, Ky
4 hours ago · USGS 03403910 |
481 cfs | 7.46 ft | · | 70°F | 964 ft | Upper Cumberland |
|
Brashears Creek At Taylorsville, Ky
4 hours ago · USGS 03295890 |
442 cfs | 7.68 ft | · | 66°F | 506 ft | Salt |
|
Levisa Fork At Paintsville, Ky
4 hours ago · USGS 03212500 |
411 cfs | 2.73 ft | · | 65°F | 604 ft | Lower Levisa |
|
Floyds Fork Near Mt Washington, Ky
4 hours ago · USGS 03298200 |
399 cfs | 5.49 ft | 76°F | 66°F | 461 ft | Salt |
|
Cumberland River Near Harlan, Ky
4 hours ago · USGS 03401000 |
383 cfs | 2.69 ft | · | 67°F | 1,170 ft | Upper Cumberland |
|
Rolling Fork Near Boston, Ky
4 hours ago · USGS 03301500 |
356 cfs | 4.99 ft | · | 67°F | 434 ft | Rolling Fork |
|
Tug Fork At Williamson, Ky
4 hours ago · USGS 03213700 |
336 cfs | 3.13 ft | · | 69°F | 623 ft | Tug |
|
Barren River At Bowling Green, Ky
5 hours ago · USGS 03314500 |
283 cfs | 4.12 ft | · | 67°F | 430 ft | Barren |
|
North Fork Kentucky River At Jackson, Ky
5 hours ago · USGS 03280000 |
247 cfs | 1.57 ft | · | 65°F | 727 ft | North Fork Kentucky |
|
Licking River At Catawba, Ky
4 hours ago · USGS 03253500 |
246 cfs | 5.68 ft | · | 64°F | 583 ft | Licking |
|
Levisa Fork At Pikeville, Ky
5 hours ago · USGS 03209500 |
210 cfs | 6.13 ft | · | 66°F | 681 ft | Lower Levisa |
|
Floyds Fork At Fisherville, Ky
4 hours ago · USGS 03298000 |
201 cfs | 1.95 ft | 76°F | 66°F | 543 ft | Salt |
|
North Elkhorn Creek At Georgetown, Ky
5 hours ago · USGS 03288100 |
199 cfs | 4.77 ft | · | 65°F | 814 ft | Lower Kentucky |
|
Nolin River At White Mills, Ky
4 hours ago · USGS 03310300 |
198 cfs | 1.73 ft | · | 65°F | 615 ft | Upper Green |
|
South Fork Kentucky River At Booneville, Ky
4 hours ago · USGS 03281500 |
192 cfs | 4.22 ft | · | 64°F | 669 ft | South Fork Kentucky |
|
Licking River At Mckinneysburg, Ky
5 hours ago · USGS 03251500 |
191 cfs | 4.51 ft | · | 64°F | 574 ft | Licking |
|
Tradewater River At Olney, Ky
5 hours ago · USGS 03383000 |
191 cfs | 3.57 ft | · | 65°F | 403 ft | Tradewater |
|
Drakes Creek Near Alvaton, Ky
6 hours ago · USGS 03314000 |
175 cfs | 4.86 ft | · | 68°F | 458 ft | Barren |
|
Licking River At Blue Lick Springs, Ky
4 hours ago · USGS 03250500 |
165 cfs | 4.54 ft | · | 65°F | 613 ft | Licking |
|
Russell Creek Near Columbia, Ky
5 hours ago · USGS 03307000 |
160 cfs | 3.03 ft | 77°F | 66°F | 668 ft | Upper Green |
|
South Elkhorn Creek Near Midway, Ky
4 hours ago · USGS 03289300 |
151 cfs | 5.08 ft | · | 65°F | 809 ft | Lower Kentucky |
|
Beech Fork At Bardstown, Ky
5 hours ago · USGS 03301000 |
145 cfs | 3.85 ft | · | 66°F | 462 ft | Rolling Fork |
|
Middle Fork Kentucky River At Tallega, Ky
4 hours ago · USGS 03281000 |
128 cfs | 5.23 ft | · | 65°F | 669 ft | Middle Fork Kentucky |
|
North Fork Kentucky River At Hazard, Ky
4 hours ago · USGS 03277500 |
113 cfs | 4.32 ft | · | 65°F | 871 ft | North Fork Kentucky |
|
Buck Creek Near Shopville, Ky
4 hours ago · USGS 03407500 |
110 cfs | 2.19 ft | · | 66°F | 838 ft | Upper Cumberland-Lake Cumberland |
|
Sturgeon Creek At Cressmont, Ky
4 hours ago · USGS 03282040 |
101 cfs | 2.85 ft | · | 64°F | 720 ft | Upper Kentucky |
|
Floyds Fork Near Pewee Valley, Ky
5 hours ago · USGS 03297900 |
77 cfs | 4.50 ft | 74°F | 65°F | 605 ft | Salt |
|
Goose Creek At Manchester, Ky
5 hours ago · USGS 03281100 |
71 cfs | 6.58 ft | · | 64°F | 848 ft | South Fork Kentucky |
|
Town Branch At Yarnallton Road At Yarnallton, Ky
4 hours ago · USGS 03289200 |
67 cfs | 1.69 ft | 72°F | 65°F | 842 ft | Lower Kentucky |
|
West Fork Drakes Creek Near Franklin, Ky
5 hours ago · USGS 03313700 |
64 cfs | 7.25 ft | · | 67°F | 592 ft | Barren |
|
Salt River At Glensboro, Ky
4 hours ago · USGS 03295400 |
61 cfs | 3.16 ft | · | 66°F | 594 ft | Salt |
|
Pond River Near Apex, Ky
5 hours ago · USGS 03320500 |
59 cfs | 5.24 ft | · | 65°F | 420 ft | Pond |
|
Beech Fork At Maud, Ky
5 hours ago · USGS 03300400 |
58 cfs | 9.25 ft | · | 66°F | 560 ft | Rolling Fork |
|
Red River At Clay City, Ky
4 hours ago · USGS 03283500 |
49 cfs | 2.76 ft | · | 69°F | 641 ft | Upper Kentucky |
|
Little Sandy River At Grayson, Ky
4 hours ago · USGS 03216500 |
48 cfs | 4.21 ft | · | 67°F | 579 ft | Little Sandy |
|
Eagle Creek At Glencoe, Ky
4 hours ago · USGS 03291500 |
43 cfs | 2.21 ft | · | 64°F | 559 ft | Lower Kentucky |
|
Martins Fork Near Smith, Ky
4 hours ago · USGS 03400800 |
43 cfs | 7.95 ft | 78°F | 65°F | 1,305 ft | Upper Cumberland |
|
Poor Fork At Cumberland, Ky
4 hours ago · USGS 03400500 |
40 cfs | 3.53 ft | · | 67°F | 1,446 ft | Upper Cumberland |
|
Dix River Near Danville, Ky
4 hours ago · USGS 03285000 |
37 cfs | 1.02 ft | · | 66°F | 812 ft | Lower Kentucky |
|
Pond Creek At Pendleton Road Near Louisville, Ky
4 hours ago · USGS 03302030 |
36 cfs | 4.55 ft | 77°F | 66°F | 413 ft | Salt |
|
Hinkston Creek Near Carlisle, Ky
5 hours ago · USGS 03252300 |
34 cfs | 3.09 ft | · | 65°F | 797 ft | South Fork Licking |
|
Cutshin Creek At Wooton, Ky
4 hours ago · USGS 03280700 |
31 cfs | 1.80 ft | · | 65°F | 876 ft | Middle Fork Kentucky |
|
South Fork Licking River At Hayes, Ky
4 hours ago · USGS 03253000 |
31 cfs | 2.88 ft | · | 64°F | 568 ft | South Fork Licking |
|
Pond Creek Near Louisville, Ky
4 hours ago · USGS 03302000 |
30 cfs | 3.26 ft | 78°F | 67°F | 452 ft | Salt |
|
Bacon Creek Near Priceville, Ky
5 hours ago · USGS 03310400 |
29 cfs | 3.70 ft | · | 66°F | 606 ft | Upper Green |
|
Slate Creek At Highway 713 Nr Mt. Sterling, Ky
4 hours ago · USGS 03250190 |
28 cfs | 1.84 ft | · | 65°F | 777 ft | Licking |
|
Gunpowder Cr At Camp Ernst Rd Nr Union, Ky
4 hours ago · USGS 03277075 |
27 cfs | 1.67 ft | 62°F | 64°F | 715 ft | Middle Ohio-Laughery |
|
Mud Lick Cr At Hwy 42 Nr Beaverlick, Ky
5 hours ago · USGS 03277130 |
27 cfs | 1.63 ft | 64°F | 64°F | 506 ft | Middle Ohio-Laughery |
|
Clarks River At Almo, Ky
5 hours ago · USGS 03610200 |
26 cfs | 4.61 ft | · | 66°F | 435 ft | Lower Tennessee |
|
Cedar Creek At Hwy 1442 Near Shepherdsville, Ky
4 hours ago · USGS 03297800 |
26 cfs | 2.53 ft | 71°F | 67°F | 437 ft | Salt |
|
Bayou De Chien Near Clinton, Ky
5 hours ago · USGS 07024000 |
25 cfs | 7.11 ft | · | 66°F | 344 ft | Bayou De Chien-Mayfield |
|
Cedar Creek At Thixton Road Near Louisville, Ky
4 hours ago · USGS 03298250 |
24 cfs | · | 73°F | 66°F | 564 ft | Salt |
|
M Fk Beargrass Cr At Lexington Rd At Louisville, Ky
4 hours ago · USGS 03293500 |
22 cfs | 2.64 ft | 70°F | 67°F | 448 ft | Silver-Little Kentucky |
|
N Elkhorn Cr At Bryan Station Rd At Montrose, Ky
4 hours ago · USGS 03287600 |
21 cfs | 1.82 ft | 77°F | 65°F | 917 ft | Lower Kentucky |
|
Licking River Below Mason Fork Nr Salyersville, Ky
4 hours ago · USGS 03248300 |
21 cfs | 4.76 ft | · | 64°F | 864 ft | Licking |
|
Martins Fork Above Smith, Ky
4 hours ago · USGS 03400785 |
21 cfs | · | · | 63°F | 1,376 ft | Upper Cumberland |
|
Chenoweth Run At Gelhaus Lane Near Fern Creek, Ky
4 hours ago · USGS 03298150 |
20 cfs | 3.16 ft | 73°F | 66°F | 540 ft | Salt |
|
South Elkhorn Creek At Fort Spring, Ky
4 hours ago · USGS 03289000 |
19 cfs | 3.01 ft | 72°F | 65°F | 855 ft | Lower Kentucky |
|
Eagle Creek At Sadieville, Ky
4 hours ago · USGS 03291000 |
19 cfs | 1.39 ft | · | 65°F | 771 ft | Lower Kentucky |
|
North Fork Kentucky River At Whitesburg, Ky
4 hours ago · USGS 03277300 |
18 cfs | 1.26 ft | · | 66°F | 1,149 ft | North Fork Kentucky |
|
Twelvemile Creek At Highway 1997 Nr Alexandria, Ky
5 hours ago · USGS 03238745 |
16 cfs | 1.97 ft | 62°F | 65°F | 507 ft | Ohio Brush-Whiteoak |
|
Wolf Run At Old Frankfort Pike At Lexington, Ky
4 hours ago · USGS 03289193 |
16 cfs | 1.34 ft | 74°F | 65°F | 877 ft | Lower Kentucky |
|
Northern Ditch At Okolona, Ky
4 hours ago · USGS 03301940 |
15 cfs | 4.47 ft | 73°F | 68°F | 454 ft | Salt |
|
M Fk Beargrass Cr At Old Cannons Ln At Louisville, Ky
5 hours ago · USGS 03293000 |
15 cfs | · | 73°F | 66°F | 481 ft | Silver-Little Kentucky |
|
Banklick Creek @ Highway 1829 Nr Erlanger, Ky
4 hours ago · USGS 03254550 |
14 cfs | 1.52 ft | 65°F | 64°F | 559 ft | Licking |
|
North Fork Nolin River At Hodgenville, Ky
4 hours ago · USGS 03310000 |
13 cfs | 3.68 ft | · | 66°F | 712 ft | Upper Green |
|
Johns Creek Near Meta, Ky
4 hours ago · USGS 03210000 |
12 cfs | 3.31 ft | · | 66°F | 741 ft | Lower Levisa |
|
Lynn Camp Creek At Corbin, Ky
4 hours ago · USGS 03404900 |
12 cfs | 2.98 ft | · | 67°F | 1,064 ft | Upper Cumberland |
|
Beaver Creek Near Monticello, Ky
4 hours ago · USGS 03413200 |
10 cfs | 2.16 ft | · | 70°F | 826 ft | Upper Cumberland-Lake Cumberland |
|
Tygarts Creek Near Greenup, Ky
5 hours ago · USGS 03217000 |
10 cfs | 2.50 ft | · | 66°F | 617 ft | Little Scioto-Tygarts |
|
South Fork Beargrass Creek At Louisville, Ky
5 hours ago · USGS 03292500 |
10 cfs | 1.83 ft | 74°F | 67°F | 461 ft | Silver-Little Kentucky |
|
Caney Creek Near Horse Branch, Ky
5 hours ago · USGS 03318800 |
10 cfs | 2.45 ft | · | 65°F | 426 ft | Rough |
|
Long Lick At Clermont, Ky
5 hours ago · USGS 03298550 |
10 cfs | 1.50 ft | · | 67°F | 465 ft | Salt |
|
Green River Near Mckinney, Ky
4 hours ago · USGS 03305000 |
8 cfs | 1.25 ft | · | 66°F | 912 ft | Upper Green |
|
Red River Near Hazel Green, Ky
4 hours ago · USGS 03282500 |
7 cfs | 2.72 ft | · | 63°F | 890 ft | Upper Kentucky |
|
North Fork Triplett Creek Near Morehead, Ky
4 hours ago · USGS 03250100 |
7 cfs | 4.50 ft | · | 65°F | 705 ft | Licking |
|
Goose Creek At Old Westport Rd Nr St Matthews, Ky
4 hours ago · USGS 03292474 |
7 cfs | 1.03 ft | 70°F | 67°F | 548 ft | Silver-Little Kentucky |
|
South Fork Panther Creek Near Whitesville, Ky
5 hours ago · USGS 03321350 |
7 cfs | 5.49 ft | · | 66°F | 414 ft | Lower Green |
|
Little Goose Creek Near Harrods Creek, Ky
4 hours ago · USGS 03292480 |
6 cfs | 3.34 ft | 72°F | 66°F | 507 ft | Silver-Little Kentucky |
|
Fern Creek At Old Bardstown Rd At Louisville, Ky
4 hours ago · USGS 03301900 |
5 cfs | 1.57 ft | 65°F | 67°F | 559 ft | Salt |
|
N Elkhorn Cr At Winchester Rd Nr Lexington, Ky
4 hours ago · USGS 03287590 |
4 cfs | 2.30 ft | 41°F | 65°F | 932 ft | Lower Kentucky |
|
Elijahs Creek @ Elijahs Creek Rd Nr Hebron, Ky
4 hours ago · USGS 03260100 |
4 cfs | 1.56 ft | 62°F | 64°F | 770 ft | Middle Ohio-Laughery |
|
Pennslyvania Run At Mt Washington Rd Nr Louisville, Ky
4 hours ago · USGS 03298300 |
3 cfs | 1.25 ft | 76°F | 66°F | 534 ft | Salt |
|
Muddy Fk At Mockingbird Valley Rd At Louisville, Ky
5 hours ago · USGS 03293530 |
3 cfs | · | 71°F | 67°F | 427 ft | Silver-Little Kentucky |
|
Massac Creek Near Paducah, Ky
6 hours ago · USGS 03611260 |
3 cfs | 2.98 ft | · | 65°F | 364 ft | Lower Ohio |
|
Mill Creek At Orell Road Near Louisville, Ky
4 hours ago · USGS 03294570 |
2 cfs | 1.20 ft | 75°F | 66°F | 416 ft | Silver-Little Kentucky |
|
Mill Creek Cutoff Near Louisville, Ky
4 hours ago · USGS 03294550 |
2 cfs | 2.79 ft | · | 67°F | 423 ft | Silver-Little Kentucky |
|
North Fork Licking River Near Mt Olivet, Ky
4 hours ago · USGS 03251200 |
1 cfs | 1.45 ft | · | 64°F | 664 ft | Licking |
|
Brier Creek At Pendelton Road Near Louisville, Ky
4 hours ago · USGS 03302050 |
1 cfs | 1.61 ft | 74°F | 66°F | 444 ft | Salt |
|
Grapevine Creek Near Phyllis, Ky
4 hours ago · USGS 03207965 |
1 cfs | 1.17 ft | · | 66°F | 808 ft | Upper Levisa |
|
Fourmile Creek At Poplar Ridge Rd Nr Alexandria, Ky
4 hours ago · USGS 03238772 |
1 cfs | 1.61 ft | 62°F | 65°F | 547 ft | Ohio Brush-Whiteoak |
|
Rock Lick Cr At State Hwy 158 Nr Sharkey, Ky
4 hours ago · USGS 03250322 |
0 cfs | · | 75°F | 69°F | 652 ft | Licking |
See every Kentucky gauge ranked against normal.
- Percentile rank & % of median for all 115 gauges
- 15-day PULSE forecast on every gauge
- Custom flow alerts & full daily history
About Kentucky streamflow
What are river levels like in Kentucky right now?
As of August 3, 2026, Kentucky rivers are running at 77% of normal across 115 USGS streamgauges, and the Ohio River At Old Shawneetown is reporting the highest discharge at 73,500 cfs. The full sortable gauge table is below.
Which Kentucky river is running highest right now?
As of August 3, 2026, the highest discharge in Kentucky is 73,500 cfs on the Ohio River At Old Shawneetown. See the sortable gauge table for the full statewide ranking.
Are Kentucky rivers high or low right now?
Compare the statewide percent-of-normal on this page: above 100% means Kentucky rivers are running higher than the seasonal average for the date, below 100% means lower (a dry spell or drought). Each gauge also shows its own percent of median.
Where does the Kentucky streamflow data come from?
The U.S. Geological Survey National Water Information System. USGS streamgauges report continuously (every 15 minutes) and the data is the canonical real-time record for U.S. rivers. Snoflo pulls the latest readings and joins them to a 7-day NOAA weather forecast for each station.
What is cfs?
Cubic feet per second — the standard unit for streamflow. One cfs is about 7.5 gallons per second. Small creeks run at single-digit cfs; the Mississippi at hundreds of thousands.
What does Gauge Height mean?
The water level at the gauge in feet above the reference datum. Used together with discharge to track river state. Flood stage and runnable levels are typically expressed in gauge height (e.g., "flood at 16 ft").
How fresh is the Kentucky data?
USGS streamgauges report every 15 minutes; Snoflo re-pulls throughout the day. The AI briefing regenerates daily.
Can I get a flow alert for a Kentucky gauge?
Yes. Save any USGS gauge as a favorite in the Snoflo iOS app, set a discharge or stage threshold (e.g. "alert me when discharge crosses 2,000 cfs"), and you'll get a push the moment it crosses.
Is this a substitute for an NWS flood warning?
No. Snoflo is informational. For flood life-safety decisions always follow guidance from your local NWS forecast office and state emergency management. Snoflo data is one input among several.