USGS



LOCATION.--Lat 41°48'45.8", long 92°03'52.6" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 NE 1/4 sec.24, T.81 N., R.11 W., Iowa County, IA, Hydrologic Unit 07080208, on left bank 5 ft upstream from bridge on County Highway V66, 0.8 mi north of Marengo, 1.0 mi downstream from Big Bear Creek, 4.6 mi upstream from Hilton Creek, and 134.1 mi upstream from mouth.DRAINAGE AREA.--2,794 mi?.PERIOD OF RECORD.--Discharge records from October 1956 to current year. Prior to January 1957, monthly mean discharge for some periods published in WSP 1728.GAGE.--Water-stage recorder. Datum of gage is 720.52 ft above National Geodetic Vertical Datum of 1929.A summary of all available data for this streamgage is provided through the USGS National Water Information System web interface (NWISWeb). The following link provides access to current/historical observations, daily data, daily statistics, monthly statistics, annual statistics, peak streamflow, field measurements, field/lab water-quality samples, and the latest water-year summaries. Data can be filtered by parameter and/or dates, and can be output in various tabular and graphical formats. USGS WaterWatch Toolkit is available at: for summarizing streamflow information include the duration hydrograph builder, the cumulative streamflow hydrograph builder, the streamgage statistics retrieval tool, the rating curve builder, the flood tracking chart builder, the National Weather Service Advanced Hydrologic Prediction Service (AHPS) river forecast hydrograph builder, and the raster-hydrograph builder. Entering the above number for this streamgage into these toolkit webpages will provide streamflow information specific to this streamgage.A description of the statistics presented for this streamgage is available in the main body of the report at: link to other streamgages included in this report, a map showing the location of the streamgages, information on the programs used to compute the statistical analyses, and references are included in the main body of the report.30575255619433Statistics Based on the Entire Streamflow Period of Record05453100 Monthly and annual flow durations, based on 1957–2013 period of record (57 years)Percentage of days discharge equaled or exceeded????Discharge (cubic feet per second)????Annual flow durationsOctNovDecJanFebMarAprMayJuneJulyAugSeptAnnualKentau statisticP-value997688503071160230176111889298790.2160.0189885955958128210242197176135110107950.2160.0189510712084841422903242912991901711381470.1900.037901571711181401903745594776184712722082300.1590.082851992471901842305427107328806133472552980.1500.100802372902502203006738421,0101,0807503972833680.1540.093752743393042623578501,1101,2101,2708824513114500.1620.077703224303623204101,0601,3301,4601,4601,0305003465410.1480.104653884974203604771,2501,5801,7901,7101,1705523766360.1570.086604425614954005601,5501,7901,9802,0001,2906214207500.1590.082555056305604496701,8001,9902,2302,3201,4306914828900.1560.088506057246294907522,0102,3102,4702,6501,6107655461,0500.1550.089456748727105608502,3302,6002,8603,0001,8008456141,2200.1500.100407559858706409502,7002,9703,2403,5002,0209437001,4400.1750.056358971,1501,0307681,1003,1503,4603,6603,9502,2701,0608231,7200.1820.047301,0801,4901,1808601,3203,6204,0004,1604,4102,5101,2009292,0100.1960.032251,2701,6701,3009701,6004,3004,5904,6105,0502,9001,3401,0602,4000.2030.026201,6101,8201,4901,1701,9705,0305,3005,2605,7903,4601,5801,2202,9700.1890.039151,9802,1001,7101,4002,4406,4006,3606,5707,1104,1702,0201,5303,8500.1850.043102,5102,5602,0902,0003,4507,8707,6807,8208,7805,9102,9602,1305,1200.1510.098 53,7303,3302,7202,4305,40010,50010,1009,39012,0009,6906,5303,7307,6700.1170.200 25,8804,8503,5604,1007,97013,40014,10012,30016,70015,80010,8006,50011,2000.0700.449 17,0805,6904,7605,2009,44015,20015,80014,00021,00020,30012,5008,01013,9000.0190.83605453100 Annual exceedance probability of instantaneous peak discharges, in cubic feet per second (ft3/s), based on the Weighted Independent Estimates method,Annual exceed-ance probabilityRecur-rence interval (years)Discharge (ft3/s)95-percent lower confi-dence interval (ft3/s)95-percent upper confi-dence interval (ft3/s)0.500212,20010,80013,7000.200520,40018,20022,8000.1001026,00022,90029,4000.0402533,50028,80038,9000.0205038,90032,70046,3000.01010044,20036,10054,1000.00520050,90040,20064,3000.00250056,80043,00074,900and based on the expected moments algorithm/multiple Grubbs-Beck analysis computed using a historical period length of 132 years (1882–2013)a0.500212,10010,40014,1000.200520,30017,50023,6000.1001026,10022,30030,7000.0402533,70028,20041,3000.0205039,50032,40050,4000.01010045,30036,30060,5000.00520051,20039,80071,9000.00250059,20044,00089,000Kentau statistic-0.048P-value0.606Begin year1957End year2013Number of peaks57??aAnalysis includes interval annual-peak discharges (1918, 1940–46, 1948–56) from streamgage 05452500 Iowa River near Belle Plaine.05453100 Annual exceedance probability of high discharges, based on 1957–2013 period of record (57 years)[ND, not determined]Annual exceed-ance probabilityRecur-rence interval (years)Maximum average discharge (ft3/s) for indicated number of consecutive days13715300.9901.01ND2,1801,7901,3401,0400.9501.05ND3,5202,9402,2601,7800.9001.11ND4,5203,8102,9502,3400.8001.25ND6,0605,1604,0503,2100.500 2ND10,4009,0307,2205,6700.200 5ND17,40015,30012,4009,5400.100 10ND22,40019,90016,30012,3000.04025ND29,30026,20021,60015,9000.02050ND34,60031,10025,70018,6000.010 100ND40,10036,10029,90021,4000.005 200ND45,70041,40034,40024,2000.002 500ND53,50048,60040,40027,900Kentau statistic-0.033-0.0260.0190.0550.086P-value0.7200.7780.8360.5490.346?05453100 Annual nonexceedance probability of low discharges, based on April 1957 to March 2013 period of record (56 years)?Annual nonexceed-ance probabilityRecur-rence interval (years)Minimum average discharge (ft3/s) for indicated number of consecutive days137143060901201830.01 1002930313236465460760.02 5039404143486072801020.05 206061626674901081221560.10 10848689951061281541742240.20 51251271321421591912332643400.50 22452512632853233924835547140.801.254414514775155977549381,0901,3900.901.115815936276747931,0401,2901,5101,9100.961.047627728198731,0501,4301,7802,1002,6200.981.028969059601,0201,2401,7402,1802,5703,1800.991.011,0201,0301,1001,1601,4202,0602,5803,0603,750Kentau statistic0.2190.2270.2180.2290.1870.1560.1380.1140.094P-value0.0170.0140.0180.0130.0430.0900.1360.2160.31205453100 Annual nonexceedance probability of seasonal low discharges, based on October 1956 to September 2013 period of record (57 years)Annual nonexceed-ance probabilityRecur-rence interval (years)Minimum average discharge (cubic feet per second) for indicated number of consecutive days171430?171430January-February-MarchApril-May-June0.01 100262830488292981110.02 50373942651151291391600.05 20606469991882102292700.10 1090971041422813163474180.20 51441561662174454985566870.50 23263543784679691,0801,2401,6100.801.256737227779511,8702,0802,4303,3400.901.119471,0101,0901,3502,5102,7803,3004,6700.961.041,3301,3901,5201,9303,3303,6804,4206,4600.981.021,6301,6901,8602,4103,9304,3405,2507,8300.991.011,9402,0002,2002,920?4,5204,9706,0509,200Kentau statistic0.2040.2210.2140.1420.2500.2320.2290.218P-value0.0250.0150.0190.121?0.0060.0110.0120.017July-August-SeptemberOctober-November-December0.01 100838689103323536440.02 509397102118444749600.05 20114120127149687379940.10 10138146157185991071171390.20 51781902072471531651842170.50 23103363744583303604084820.801.255976567379326607278269880.901.118759681,0901,4009221,0201,1501,3900.961.041,3601,5101,7002,2401,2901,4301,6101,9700.981.021,8402,0502,3003,0801,5801,7701,9602,4400.991.012,4502,7303,0604,150?1,8902,1202,3302,920Kentau statistic0.1350.1220.1300.0710.1290.1250.1220.108P-value0.1390.1840.1540.437?0.1580.1710.1840.239Statistics Based on the 1984–2013 Streamflow Period of Record05453100 Monthly and annual flow durations, based on 1984–2013 period of record (30 years)Percentage of days discharge equaled or exceeded????Discharge (cubic feet per second)????Annual flow durationsOctNovDecJanFebMarAprMayJuneJulyAugSeptAnnualKentau statisticP-value99849348601421402472001881359093890.1490.25498871016076155285284257224147102981010.1310.31895100117921082264003883823241791221151600.0550.68290154152127210298616615821671315180203275-0.0250.858852433132502903587087861,0801,000610349268360-0.0180.901802683513593604279209881,3601,290898438296437-0.0090.957752994694173825001,0601,1901,8101,6401,130502322537-0.0160.915703705384954195721,2101,4002,0401,9201,250560357623-0.0550.682654105945504506801,4201,7202,3202,3201,390638374730-0.0710.592604616465884807471,6501,9202,5502,6901,590721408857-0.0530.695555637046325208141,9002,1403,0003,0101,7907804401,000-0.0160.915506487926805808902,1002,4503,3503,5201,9808455011,170-0.0230.872457089118186471,0002,3302,7203,6604,0302,2209365661,3600.0050.986408171,0209197601,1202,6403,1604,0904,4502,4601,0506521,6600.0460.735359811,2001,1108391,4003,0003,6604,5005,0002,7101,1608631,9500.0110.943301,1301,5301,2609001,6003,4304,2005,1005,5203,1501,2509662,2800.0210.887251,3201,7101,4101,0001,8103,8504,6505,7706,3803,5501,4401,0802,7300.0570.668201,7401,9701,6201,1602,0604,8505,2106,8907,4604,1101,8201,2703,4000.0740.580152,2202,2202,0401,3002,4506,1206,3607,6808,8905,0302,3101,5904,3100.0990.454103,1502,6502,4601,8003,1207,6707,4908,55011,0006,2804,0602,2605,7000.0830.532 54,4803,3003,0002,2004,9809,2609,16010,20014,70011,4007,8404,3708,3000.0760.568 26,2305,1903,8302,5407,09012,90012,60013,10019,80016,80012,4006,56012,0000.0990.454 18,2507,5004,5902,9009,00014,90015,10014,30028,20023,60016,9008,08015,1000.0760.56805453100 Annual exceedance probability of high discharges, based on 1984–2013 period of record (30 years)Annual exceed-ance probabilityRecur-rence interval (years)Maximum average discharge (ft3/s) for indicated number of consecutive days13715300.9901.012,4502,2401,7901,4101,0800.9501.053,6203,3702,8402,2901,8500.9001.114,5004,2203,6402,9702,4400.8001.255,8905,5804,9104,0503,3700.500 210,2009,6608,7407,3106,0400.200 518,10017,10015,60013,10010,4000.100 1024,90023,40021,00017,70013,5000.0402535,30032,70029,10024,40017,7000.0205044,60040,80035,80030,00021,0000.010 10055,10050,00043,20036,10024,3000.005 20067,20060,30051,30042,70027,7000.002 50085,80075,90063,20052,40032,300Kentau statistic0.0550.0530.0900.1080.103P-value0.6820.6950.4980.4120.432?05453100 Annual nonexceedance probability of low discharges, based on April 1983 to March 2013 period of record (30 years)?Annual nonexceed-ance probabilityRecur-rence interval (years)Minimum average discharge (ft3/s) for indicated number of consecutive days137143060901201830.01 1004041424347575960710.02 505253555763768183990.05 2077798287951131271331600.10101051091141231351591841972390.20 51521581661811992352803073750.50 22882983163493854615696438070.801.255045175475976738331,0301,1901,5400.901.116556667037578661,1001,3401,5602,0600.961.048478538959461,1001,4401,7302,0102,7300.981.029889901,0301,0701,2701,7002,0002,3403,2200.991.011,1201,1301,1601,1901,4301,9502,2602,6403,680Kentau statistic0.0620.0670.0480.0480.0070.000-0.039-0.071-0.085P-value0.6430.6170.7210.7210.9721.0000.7750.5920.52105453100 Annual nonexceedance probability of seasonal low discharges, based on October 1983 to September 2013 period of record (30 years)Annual nonexceed-ance probabilityRecur-rence interval (years)Minimum average discharge (cubic feet per second) for indicated number of consecutive days171430?171430January-February-MarchApril-May-June0.01 100394549901101171211470.02 505463671131541651722070.05 20861001061582492672843410.10 101271461562123703974305180.20 51982252402985766216878390.50 24214674975561,2101,3201,5101,9500.801.257998599119942,2302,4502,9004,0800.901.111,0701,1301,2001,3302,9203,2303,8805,7800.961.041,4201,4601,5501,7803,7604,1805,1108,1500.981.021,6701,7001,8002,1404,3604,8606,00010,0000.991.011,9201,9302,0402,510?4,9105,5006,85012,000Kentau statistic-0.044-0.039-0.044-0.0990.1400.1360.1590.182P-value0.7480.7750.7480.454?0.2840.3010.2250.164July-August-SeptemberOctober-November-December0.01 10077818696373939460.02 50889299111515456650.05 201071141231408085911050.10 101321401521761161241361580.20 51731862042391791922152490.50 23233513904743734064615410.801.256897608481,0706987748711,0500.901.111,0801,2001,3401,7409291,0401,1601,4200.961.041,8302,0602,2903,0401,2201,3901,5101,9000.981.022,6402,9803,3004,4801,4401,6501,7702,2500.991.013,7404,2404,6706,450?1,6501,9102,0102,600Kentau statistic0.0780.0800.0900.0250.0180.002-0.011-0.053P-value0.5560.5440.4980.858?0.9011.0000.9430.695 ................
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