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USGS Surface-Water Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 01029500 East Branch Penobscot River at Grindstone, Maine


Penobscot County, Maine
Hydrologic Unit Code 01020002
Latitude  45°43'49", Longitude  68°35'22" NAD83
Drainage area 837  square miles
Contributing drainage area 1,086.0  square miles
Gage datum 294.10 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1902-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 1,370 1,000 1,140 2,840 7,250 2,880 1,720 962 965 1,240 1,830 2,070
2 1,350 982 1,120 3,030 7,010 2,870 1,690 918 932 1,230 1,730 2,060
3 1,330 996 1,100 3,240 6,700 2,830 1,610 923 914 1,160 1,770 1,910
4 1,310 1,060 1,100 3,420 6,610 2,710 1,540 908 949 1,140 2,090 1,860
5 1,270 1,080 1,100 3,540 6,450 2,640 1,550 911 936 1,130 2,060 1,730
6 1,240 1,090 1,100 3,560 6,130 2,530 1,540 909 895 1,110 1,940 1,680
7 1,260 1,060 1,140 3,570 5,920 2,480 1,550 892 881 1,120 1,850 1,810
8 1,220 1,040 1,160 3,750 5,770 2,530 1,520 905 864 1,200 1,880 1,820
9 1,190 1,030 1,180 3,840 5,650 2,500 1,550 939 849 1,210 2,040 1,730
10 1,190 1,010 1,210 3,910 5,540 2,360 1,460 962 907 1,220 2,080 1,720
11 1,170 989 1,240 3,930 5,370 2,270 1,460 1,020 911 1,160 1,980 1,770
12 1,170 999 1,280 4,020 5,070 2,250 1,380 1,030 1,000 1,070 1,890 1,960
13 1,160 1,030 1,340 4,270 4,960 2,270 1,340 976 1,010 1,100 1,830 1,960
14 1,150 1,020 1,410 4,670 4,820 2,240 1,290 983 1,020 1,090 1,830 1,980
15 1,180 1,010 1,390 5,010 4,630 2,150 1,250 969 1,030 1,180 1,830 1,860
16 1,180 988 1,370 5,270 4,490 2,130 1,300 935 998 1,300 1,870 1,770
17 1,140 984 1,400 5,390 4,290 2,080 1,250 902 992 1,400 1,930 1,680
18 1,130 993 1,480 5,690 4,200 2,160 1,210 913 997 1,470 1,880 1,670
19 1,130 988 1,560 5,860 4,170 2,250 1,200 976 932 1,430 1,810 1,820
20 1,140 978 1,730 5,990 4,080 2,130 1,220 982 925 1,410 1,810 1,720
21 1,120 980 1,760 6,240 3,980 2,070 1,180 940 910 1,490 1,830 1,670
22 1,110 998 1,810 6,480 3,750 1,970 1,160 921 895 1,520 1,790 1,700
23 1,110 1,020 1,870 6,680 3,630 1,950 1,160 906 927 1,420 1,800 1,630
24 1,080 1,050 1,870 6,950 3,460 1,860 1,110 876 975 1,550 1,780 1,620
25 1,050 1,080 1,900 6,960 3,370 1,770 1,090 890 1,050 1,770 1,720 1,640
26 1,100 1,100 2,040 6,950 3,360 1,770 1,070 929 1,070 1,900 1,780 1,740
27 1,110 1,100 2,170 6,910 3,380 1,760 1,110 907 1,110 1,940 1,820 1,660
28 1,090 1,110 2,270 7,080 3,270 1,730 1,080 881 1,110 1,780 1,910 1,580
29 1,070 1,220 2,440 7,310 3,210 1,730 1,090 992 1,230 1,800 1,930 1,520
30 1,030   2,560 7,520 3,080 1,760 1,100 1,010 1,180 1,820 1,970 1,450
31 1,000   2,680   2,970   1,080 962   1,840   1,420