Chesapeake Bay Period-of-Record Summary Statistics

Chesapeake Bay streamflow period-of-record summary statistics are listed in tabular form. Streamflow codes are identified as follows: A, approved data; B, computed using only approved data; e, value involves manual editing by USGS personnel; L, computed using a summation of other values; M, computed using a model; N, computed using more than one model; P, provisional data; Q, computed using provisional data.
YearMonthDateInflow CodeEstimated Inflow (cfs)POR MeanPOR MinimumPOR 25th PercentilePOR 75th PercentilePOR Maximum
202092020-09PN320003800090001700036000201000
202082020-08PN3900034000100002000040000133000
202072020-07PN2700040000110002500046000121000
202062020-06PN6700065000180004200076000343000
202052020-05PN1480001010003300062000131000217000
202042020-04PN1260001420005600097000175000390000
202032020-03PN10300014400052000103000178000299000
202022020-02PN1180001030003600072000130000229000
202012020-01PN96000910001800057000117000246000
2019122019-12PN77000850001700051000106000221000
2019112019-11PN6800062000150003100078000212000
2019102019-10PN3300045000100002200054000174000
201992019-09PN210003800090001700036000201000
201982019-08PN3200034000100002000040000133000
201972019-07PN5400040000110002500046000121000
201962019-06PN9500065000180004200076000343000
201952019-05PN1470001010003300062000131000217000
201942019-04PN1540001420005600097000175000390000
201932019-03AN16000014400052000103000178000299000
201922019-02AN1760001030003600072000130000229000
201912019-01AN166000910001800057000117000246000
2018122018-12AN207000850001700051000106000221000
2018112018-11QeN21200062000150003100078000212000
2018102018-10QeN13000045000100002200054000174000
201892018-09QN2010003800090001700036000201000
201882018-08QN13300034000100002000040000133000
201872018-07QN10100040000110002500046000121000
201862018-06QN11100065000180004200076000343000
201852018-05QN1580001010003300062000131000217000
201842018-04QN1470001420005600097000175000390000
201832018-03QeN10500014400052000103000178000299000
201822018-02QN1570001030003600072000130000229000
201812018-01QN70000910001800057000117000246000
2017122017-12QN29000850001700051000106000221000
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195171951-07BN4300040000110002500046000121000
195161951-06BN8700065000180004200076000343000
195151951-05BN670001010003300062000131000217000
195141951-04BN1780001420005600097000175000390000
195131951-03BN14500014400052000103000178000299000
195121951-02BN1750001030003600072000130000229000
195111951-01BN118000910001800057000117000246000
1950121950-12BN174000850001700051000106000221000
1950111950-11BN11100062000150003100078000212000
1950101950-10BN4600045000100002200054000174000
195091950-09BN640003800090001700036000201000
195081950-08BN2900034000100002000040000133000
195071950-07BN3500040000110002500046000121000
195061950-06BN7400065000180004200076000343000
195051950-05BN1010001010003300062000131000217000
195041950-04BN1340001420005600097000175000390000
195031950-03BN13600014400052000103000178000299000
195021950-02BN1300001030003600072000130000229000
195011950-01BN100000910001800057000117000246000
1949121949-12BN70000850001700051000106000221000
1949111949-11BN4300062000150003100078000212000
1949101949-10BN2600045000100002200054000174000
194991949-09BN320003800090001700036000201000
194981949-08BN3900034000100002000040000133000
194971949-07BN6800040000110002500046000121000
194961949-06BN5200065000180004200076000343000
194951949-05BN860001010003300062000131000217000
194941949-04BN1180001420005600097000175000390000
194931949-03BN9600014400052000103000178000299000
194921949-02BN1360001030003600072000130000229000
194911949-01BN191000910001800057000117000246000
1948121948-12BN135000850001700051000106000221000
1948111948-11BN7200062000150003100078000212000
1948101948-10BN3800045000100002200054000174000
194891948-09BN200003800090001700036000201000
194881948-08BN4800034000100002000040000133000
194871948-07BN4100040000110002500046000121000
194861948-06BN5900065000180004200076000343000
194851948-05BN1320001010003300062000131000217000
194841948-04BN1870001420005600097000175000390000
194831948-03BN17600014400052000103000178000299000
194821948-02BN970001030003600072000130000229000
194811948-01BN49000910001800057000117000246000
1947121947-12BN40000850001700051000106000221000
1947111947-11BN6100062000150003100078000212000
1947101947-10BN2000045000100002200054000174000
194791947-09BN270003800090001700036000201000
194781947-08BN3600034000100002000040000133000
194771947-07BN6200040000110002500046000121000
194761947-06BN7600065000180004200076000343000
194751947-05BN1280001010003300062000131000217000
194741947-04BN1210001420005600097000175000390000
194731947-03BN10000014400052000103000178000299000
194721947-02BN610001030003600072000130000229000
194711947-01BN101000910001800057000117000246000
1946121946-12BN29000850001700051000106000221000
1946111946-11BN3100062000150003100078000212000
1946101946-10BN3800045000100002200054000174000
194691946-09BN200003800090001700036000201000
194681946-08BN3600034000100002000040000133000
194671946-07BN4200040000110002500046000121000
194661946-06BN12300065000180004200076000343000
194651946-05BN1470001010003300062000131000217000
194641946-04BN600001420005600097000175000390000
194631946-03BN15700014400052000103000178000299000
194621946-02BN720001030003600072000130000229000
194611946-01BN120000910001800057000117000246000
1945121945-12BN107000850001700051000106000221000
1945111945-11BN9600062000150003100078000212000
1945101945-10BN6200045000100002200054000174000
194591945-09BN790003800090001700036000201000
194581945-08BN4600034000100002000040000133000
194571945-07BN4900040000110002500046000121000
194561945-06BN5900065000180004200076000343000
194551945-05BN1290001010003300062000131000217000
194541945-04BN940001420005600097000175000390000
194531945-03BN22200014400052000103000178000299000
194521945-02BN890001030003600072000130000229000
194511945-01BN69000910001800057000117000246000
1944121944-12BN59000850001700051000106000221000
1944111944-11BN2700062000150003100078000212000
1944101944-10BN3500045000100002200054000174000
194491944-09BN360003800090001700036000201000
194481944-08BN1500034000100002000040000133000
194471944-07BN2300040000110002500046000121000
194461944-06BN5000065000180004200076000343000
194451944-05BN1200001010003300062000131000217000
194441944-04BN1330001420005600097000175000390000
194431944-03BN17000014400052000103000178000299000
194421944-02BN520001030003600072000130000229000
194411944-01BN45000910001800057000117000246000
1943121943-12BN26000850001700051000106000221000
1943111943-11BN7000062000150003100078000212000
1943101943-10BN2600045000100002200054000174000
194391943-09BN130003800090001700036000201000
194381943-08BN1900034000100002000040000133000
194371943-07BN3500040000110002500046000121000
194361943-06BN7000065000180004200076000343000
194351943-05BN1480001010003300062000131000217000
194341943-04BN1350001420005600097000175000390000
194331943-03BN15800014400052000103000178000299000
194321943-02BN1330001030003600072000130000229000
194311943-01BN149000910001800057000117000246000
1942121942-12BN104000850001700051000106000221000
1942111942-11BN7800062000150003100078000212000
1942101942-10BN12300045000100002200054000174000
194291942-09BN330003800090001700036000201000
194281942-08BN7200034000100002000040000133000
194271942-07BN3800040000110002500046000121000
194261942-06BN6600065000180004200076000343000
194251942-05BN1220001010003300062000131000217000
194241942-04BN1120001420005600097000175000390000
194231942-03BN13700014400052000103000178000299000
194221942-02BN560001030003600072000130000229000
194211942-01BN41000910001800057000117000246000
1941121941-12BN43000850001700051000106000221000
1941111941-11BN1700062000150003100078000212000
1941101941-10BN1000045000100002200054000174000
194191941-09BN140003800090001700036000201000
194181941-08BN2000034000100002000040000133000
194171941-07BN4100040000110002500046000121000
194161941-06BN4100065000180004200076000343000
194151941-05BN330001010003300062000131000217000
194141941-04BN1410001420005600097000175000390000
194131941-03BN8500014400052000103000178000299000
194121941-02BN500001030003600072000130000229000
194111941-01BN82000910001800057000117000246000
1940121940-12BN82000850001700051000106000221000
1940111940-11BN5900062000150003100078000212000
1940101940-10BN2500045000100002200054000174000
194091940-09BN480003800090001700036000201000
194081940-08BN5700034000100002000040000133000
194071940-07BN4100040000110002500046000121000
194061940-06BN9300065000180004200076000343000
194051940-05BN830001010003300062000131000217000
194041940-04BN3090001420005600097000175000390000
194031940-03BN10100014400052000103000178000299000
194021940-02BN650001030003600072000130000229000
194011940-01BN28000910001800057000117000246000
1939121939-12BN27000850001700051000106000221000
1939111939-11BN3300062000150003100078000212000
1939101939-10BN2100045000100002200054000174000
193991939-09BN150003800090001700036000201000
193981939-08BN3300034000100002000040000133000
193971939-07BN3000040000110002500046000121000
193961939-06BN3100065000180004200076000343000
193951939-05BN510001010003300062000131000217000
193941939-04BN1290001420005600097000175000390000
193931939-03BN15600014400052000103000178000299000
193921939-02BN1890001030003600072000130000229000
193911939-01BN53000910001800057000117000246000
1938121938-12BN84000850001700051000106000221000
1938111938-11BN3100062000150003100078000212000
1938101938-10BN2300045000100002200054000174000
193891938-09BN330003800090001700036000201000
193881938-08BN4800034000100002000040000133000
193871938-07BN4800040000110002500046000121000
193861938-06BN5000065000180004200076000343000
193851938-05BN590001010003300062000131000217000
193841938-04BN890001420005600097000175000390000
193831938-03BN11200014400052000103000178000299000
193821938-02BN1020001030003600072000130000229000
193811938-01BN79000910001800057000117000246000
1937121937-12BN80000850001700051000106000221000
1937111937-11BN10700062000150003100078000212000
1937101937-10BN11200045000100002200054000174000
193791937-09BN470003800090001700036000201000
193781937-08BN5600034000100002000040000133000
193771937-07BN3800040000110002500046000121000
193761937-06BN5000065000180004200076000343000
193751937-05BN1080001010003300062000131000217000
193741937-04BN1850001420005600097000175000390000
193731937-03BN8600014400052000103000178000299000
193721937-02BN1300001030003600072000130000229000
193711937-01BN213000910001800057000117000246000
1936121936-12BN80000850001700051000106000221000
1936111936-11BN4800062000150003100078000212000
1936101936-10BN3300045000100002200054000174000
All values are provisional and subject to revision.