Search
Menu

Explore

Hazards

Analysis

Rankings

Reference

Alcovy River at New Hope Road near Grayson

Highest listed crest 14.93 ftFlood stage 9.0 ft62 crests since 2001

The Alcovy River at New Hope Road near Grayson crested above flood stage 62 times among the 62 crests the National Weather Service lists from 2001 to 2025. The highest, 14.93 ft on June 17, 2003, was moderate flooding, 5.93 feet above flood stage.

The gauge

Highest listed crest
14.93 ft
June 17, 2003; 8,630 cubic feet per second
Flood stage
9.0 ft
Major flooding from 16.0 ft
Crests at major
0
62 above flood stage
Most recent flood crest
August 5, 2025
9.50 ft, minor flooding
Location
Gwinnett County
Near Loganville (6.0 mi), Lawrenceville (6.5 mi), Auburn (7.5 mi)

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Alcovy River at New Hope Road near Grayson
Action stage7.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)9.046Aug 5, 2025Minimal or no property damage, but possibly some public threat
Moderate flood stage11.016Feb 13, 2025Some inundation of structures and roads near the stream
Major flood stage16.00—Extensive inundation of structures and roads

Every listed crest

62 crests from 2001 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Alcovy River at New Hope Road near Grayson, 2001 to 2025 810121416ft Flood stage 9.0 ftMajor 16.0 ft Mar 15, 2001: 9.46 ft, minor flooding; 1,270 cubic feet per secondMar 4, 2002: 9.63 ft, minor flooding; 1,430 cubic feet per secondJun 17, 2003: 14.93 ft, moderate flooding; 8,630 cubic feet per secondSep 17, 2004: 12.14 ft, moderate flooding; 3,920 cubic feet per secondMar 28, 2005: 11.98 ft, moderate flooding; 3,630 cubic feet per secondOct 8, 2005: 9.22 ft, minor flooding; 1,270 cubic feet per secondNov 15, 2006: 9.19 ft, minor flooding; 1,250 cubic feet per secondSep 16, 2009: 9.70 ft, minor flooding; 1,625 cubic feet per secondSep 22, 2009: 13.85 ft, moderate flooding; 6,470 cubic feet per secondOct 12, 2009: 12.02 ft, moderate flooding; 3,775 cubic feet per secondNov 11, 2009: 10.63 ft, minor flooding; 2,344 cubic feet per secondDec 19, 2009: 9.86 ft, minor flooding; 1,734 cubic feet per secondDec 25, 2009: 9.67 ft, minor flooding; 1,605 cubic feet per secondJan 25, 2010: 12.09 ft, moderate flooding; 3,865 cubic feet per secondFeb 5, 2010: 9.35 ft, minor flooding; 1,403 cubic feet per secondMay 3, 2010: 10.74 ft, minor flooding; 2,441 cubic feet per secondDec 1, 2010: 9.07 ft, minor flooding; 1,190 cubic feet per secondMay 5, 2013: 9.56 ft, minor flooding; 1,480 cubic feet per secondMay 19, 2013: 10.93 ft, minor flooding; 2,557 cubic feet per secondDec 23, 2013: 9.17 ft, minor flooding; 1,248 cubic feet per secondJan 11, 2014: 10.81 ft, minor flooding; 2,449 cubic feet per secondApr 7, 2014: 10.10 ft, minor flooding; 1,858 cubic feet per secondJan 4, 2015: 9.45 ft, minor flooding; 1,411 cubic feet per secondAug 19, 2015: 9.31 ft, minor flooding; 1,330 cubic feet per secondAug 23, 2015: 12.74 ft, moderate flooding; 4,696 cubic feet per secondNov 2, 2015: 11.02 ft, moderate flooding; 2,640 cubic feet per secondNov 7, 2015: 9.36 ft, minor flooding; 1,359 cubic feet per secondDec 24, 2015: 10.00 ft, minor flooding; 1,780 cubic feet per secondDec 29, 2015: 9.67 ft, minor flooding; 1,556 cubic feet per secondJan 22, 2016: 9.32 ft, minor flooding; 1,336 cubic feet per secondFeb 3, 2016: 10.54 ft, minor flooding; 2,206 cubic feet per secondJan 21, 2017: 10.12 ft, minor flooding; 1,874 cubic feet per secondApr 5, 2017: 10.11 ft, minor flooding; 1,866 cubic feet per secondMay 30, 2018: 9.29 ft, minor flooding; 1,318 cubic feet per secondJun 27, 2018: 9.77 ft, minor flooding; 1,624 cubic feet per secondAug 3, 2018: 9.14 ft, minor flooding; 1,231 cubic feet per secondNov 13, 2018: 9.37 ft, minor flooding; 1,356 cubic feet per secondDec 9, 2018: 9.64 ft, minor flooding; 1,524 cubic feet per secondDec 28, 2018: 11.52 ft, moderate flooding; 3,139 cubic feet per secondJan 4, 2019: 9.62 ft, minor flooding; 1,511 cubic feet per secondJan 24, 2019: 9.13 ft, minor flooding; 1,220 cubic feet per secondApr 19, 2019: 13.64 ft, moderate flooding; 6,073 cubic feet per secondJan 3, 2020: 9.58 ft, minor flooding; 1,485 cubic feet per secondFeb 6, 2020: 10.81 ft, minor flooding; 2,430 cubic feet per secondFeb 13, 2020: 9.24 ft, minor flooding; 1,281 cubic feet per secondFeb 19, 2020: 10.18 ft, minor flooding; 1,906 cubic feet per secondAug 31, 2020: 10.74 ft, minor flooding; 2,368 cubic feet per secondSep 17, 2020: 12.48 ft, moderate flooding; 4,306 cubic feet per secondOct 11, 2020: 11.76 ft, moderate flooding; 3,411 cubic feet per secondMay 5, 2021: 9.25 ft, minor flooding; 1,287 cubic feet per secondJul 25, 2021: 10.15 ft, minor flooding; 1,883 cubic feet per secondFeb 4, 2022: 10.43 ft, minor flooding; 2,104 cubic feet per secondApr 6, 2022: 10.37 ft, minor flooding; 2,055 cubic feet per secondJul 21, 2022: 11.26 ft, moderate flooding; 2,864 cubic feet per secondJan 4, 2023: 10.35 ft, minor floodingJun 21, 2023: 9.29 ft, minor flooding; 1,427 cubic feet per secondJan 9, 2024: 12.61 ft, moderate flooding; 4,614 cubic feet per secondMar 6, 2024: 10.79 ft, minor flooding; 2,554 cubic feet per secondSep 27, 2024: 11.97 ft, moderate flooding; 3,792 cubic feet per secondFeb 13, 2025: 11.79 ft, moderate flooding; 3,582 cubic feet per secondJun 13, 2025: 9.17 ft, minor flooding; 1,356 cubic feet per secondAug 5, 2025: 9.50 ft, minor flooding; 1,558 cubic feet per second Highest, 14.93 ft, Jun 17, 2003 20052010201520202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Alcovy River at New Hope Road near Grayson 2000s: 13 2010s: 29 29 2020s: 20 2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

The 50 highest of 62 listed crests.

Highest listed crests, Alcovy River at New Hope Road near Grayson
1Jun 17, 200314.93+5.93Moderate8,630
2Sep 22, 200913.85+4.85Moderate6,470
3Apr 19, 201913.64+4.64Moderate6,073
4Aug 23, 201512.74+3.74Moderate4,696
5Jan 9, 202412.61+3.61Moderate4,614
6Sep 17, 202012.48+3.48Moderate4,306
7Sep 17, 200412.14+3.14Moderate3,920
8Jan 25, 201012.09+3.09Moderate3,865
9Oct 12, 200912.02+3.02Moderate3,775
10Mar 28, 200511.98+2.98Moderate3,630
11Sep 27, 202411.97+2.97Moderate3,792
12Feb 13, 202511.79+2.79Moderate3,582
13Oct 11, 202011.76+2.76Moderate3,411
14Dec 28, 201811.52+2.52Moderate3,139
15Jul 21, 202211.26+2.26Moderate2,864
16Nov 2, 201511.02+2.02Moderate2,640
17May 19, 201310.93+1.93Minor2,557
18Jan 11, 201410.81+1.81Minor2,449
19Feb 6, 202010.81+1.81Minor2,430
20Mar 6, 202410.79+1.79Minor2,554
21May 3, 201010.74+1.74Minor2,441
22Aug 31, 202010.74+1.74Minor2,368
23Nov 11, 200910.63+1.63Minor2,344
24Feb 3, 201610.54+1.54Minor2,206
25Feb 4, 202210.43+1.43Minor2,104
26Apr 6, 202210.37+1.37Minor2,055
27Jan 4, 202310.35+1.35Minor—
28Feb 19, 202010.18+1.18Minor1,906
29Jul 25, 202110.15+1.15Minor1,883
30Jan 21, 201710.12+1.12Minor1,874
31Apr 5, 201710.11+1.11Minor1,866
32Apr 7, 201410.10+1.10Minor1,858
33Dec 24, 201510.00+1.00Minor1,780
34Dec 19, 20099.86+0.86Minor1,734
35Jun 27, 20189.77+0.77Minor1,624
36Sep 16, 20099.70+0.70Minor1,625
37Dec 25, 20099.67+0.67Minor1,605
38Dec 29, 20159.67+0.67Minor1,556
39Dec 9, 20189.64+0.64Minor1,524
40Mar 4, 20029.63+0.63Minor1,430
41Jan 4, 20199.62+0.62Minor1,511
42Jan 3, 20209.58+0.58Minor1,485
43May 5, 20139.56+0.56Minor1,480
44Aug 5, 20259.50+0.50Minor1,558
45Mar 15, 20019.46+0.46Minor1,270
46Jan 4, 20159.45+0.45Minor1,411
47Nov 13, 20189.37+0.37Minor1,356
48Nov 7, 20159.36+0.36Minor1,359
49Feb 5, 20109.35+0.35Minor1,403
50Jan 22, 20169.32+0.32Minor1,336

The worst floods along the Alcovy River

For this gauge's highest crests, the other gauges on the Alcovy River that crested above flood stage within a week.

April 19, 2019: 13.64 ft here, moderate flooding

  • CovingtonGA · Apr 21, 2019 · 15.61 ft · Moderate
  • CovingtonGA · Apr 21, 2019 · 13.57 ft · Minor

January 9, 2024: 12.61 ft here, moderate flooding

  • CovingtonGA · Jan 11, 2024 · 15.84 ft · Moderate
  • CovingtonGA · Jan 11, 2024 · 13.13 ft · Minor

Gauges on the Alcovy River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Alcovy River
New Hope Road near Grayson this gaugeGA9.014.93 ft, Jun 17, 20030
CovingtonGA12.014.79 ft, Mar 16, 19760
CovingtonGA11.022.40 ft, Apr 16, 19363

Other gauges in Gwinnett County

Flood gauges in Gwinnett County
Fence Road near Dacula8.08.56 ft, Sep 21, 20090
Lenora Road near Snellville10.012.74 ft, Apr 19, 20190
Beaver Road near Loganville9.09.69 ft, Dec 24, 20150
Norcross11.014.59 ft, Sep 21, 20090
Suwanee Dam Road near Suwanee9.013.04 ft, May 19, 20130
Lee Road near Snellville9.010.91 ft, Jul 7, 20050
Graves Road near Norcross12.012.93 ft, Sep 21, 20090
Patterson Road near Lawrenceville11.016.69 ft, Sep 21, 20090
Suwanee Dam Road near Buford10.010.45 ft, May 19, 20130
Paper Mill Rd near Lawrenceville11.013.12 ft, Sep 21, 20090
Suwanee8.014.30 ft, Sep 21, 20091
Club Drive near Lilburn11.015.90 ft, Sep 21, 20090
Bill Cheek Road near Auburn6.07.18 ft, Sep 21, 20020
Snellville23.023.75 ft, Sep 27, 20240

Gwinnett County: every hazard · River floods across the country · Georgia

NOAA National Water Prediction Service, gauge ALCG1, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.