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USGS Current Water Data for Massachusetts

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ICE EFFECTS ON STREAMFLOW During winter, ice formation may cause stage and discharge values to appear higher than expected. Ice effects may be minor (occurring only at night and early morning) with baseline flows obvious, or the effects may be major (stage constantly increases over several days or weeks) resulting in greatly erroneous discharge. Streamgages experiencing minor ice conditions will continue to display stage and discharge values to enable users to estimate the approximate base-line stage and discharge. Streamgages experiencing major ice conditions will have the discharge record temporarily disabled to prevent use of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Daily mean discharges during periods of ice effect will be estimated after detailed data analysis.

Daily Streamflow Conditions

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Stream gage levels in Massachusetts, relative to 30 year average. 01186500: Flow=671cfs,Stage=3.99ft,2015-02-01 06:30,>90,STILL RIVER AT ROBERTSVILLE, CT01168500: Flow=1810cfs,Stage=3.79ft,2015-02-01 06:30,>90,DEERFIELD RIVER AT CHARLEMONT, MA01104500: Flow=123cfs,Stage=1.49ft,Floodstage=5ft,2015-02-01 06:30,<10,CHARLES RIVER AT WALTHAM, MA01114500: Flow=16cfs,Stage=1.94ft,Floodstage=5.5ft,2015-02-01 06:45,<10,WOONASQUATUCKET RIVER AT CENTERDALE, RI01185500: Flow=246cfs,Stage=3.66ft,Floodstage=8ft,2015-02-01 06:30,76-90,WEST BRANCH FARMINGTON RIVER NEAR NEW BOSTON, MA01181000: Flow=193cfs,Stage=4.16ft,2015-02-01 06:30,76-90,WEST BRANCH WESTFIELD RIVER AT HUNTINGTON, MA01179500: Flow=340cfs,Stage=3.75ft,2015-02-01 06:30,76-90,WESTFIELD RIVER AT KNIGHTVILLE, MA01177000: Flow=1470cfs,Stage=5.81ft,Floodstage=12ft,2015-02-01 06:30,76-90,CHICOPEE RIVER AT INDIAN ORCHARD, MA01173000: Flow=298cfs,Stage=5.32ft,2015-02-01 06:45,76-90,WARE RIVER AT INTAKE WORKS NEAR BARRE, MA01170000: Flow=2220cfs,Stage=3.93ft,2015-02-01 06:30,76-90,DEERFIELD RIVER NEAR WEST DEERFIELD, MA01110500: Flow=525cfs,2015-02-01 06:00,Stage=3.79ft,2015-02-01 06:30:00,Floodstage=9ft,76-90,BLACKSTONE RIVER AT NORTHBRIDGE, MA01100000: Flow=10200cfs,Stage=44.73ft,Floodstage=52ft,2015-02-01 06:30,76-90,MERRIMACK RIVER BL CONCORD RIVER AT LOWELL, MA01333000: Flow=33cfs,Stage=1.65ft,2015-02-01 07:15,10-24,GREEN RIVER AT WILLIAMSTOWN, MA01184100: Flow=8.0cfs,Stage=1.49ft,2015-02-01 07:00,10-24,STONY BROOK NEAR WEST SUFFIELD, CT01116500: Flow=212cfs,Stage=4.09ft,Floodstage=9ft,2015-02-01 06:45,10-24,PAWTUXET RIVER AT CRANSTON, RI01114000: Flow=21cfs,Stage=1.62ft,2015-02-01 06:45,10-24,MOSHASSUCK RIVER AT PROVIDENCE, RI01111500: Flow=105cfs,Stage=2.59ft,2015-02-01 07:15,10-24,BRANCH RIVER AT FORESTDALE, RI01111300: Flow=19cfs,Stage=3.52ft,2015-02-01 07:15,10-24,NIPMUC RIVER NEAR HARRISVILLE, RI01111200: Flow=27cfs,Stage=1.71ft,2015-02-01 06:30,10-24,WEST RIVER BELOW WEST HILL DAM, NR UXBRIDGE, MA01105730: Flow=39cfs,Stage=1.96ft,2015-02-01 07:30,10-24,INDIAN HEAD RIVER AT HANOVER, MA01104200: Flow=142cfs,Stage=3.10ft,2015-02-01 07:15,10-24,CHARLES RIVER AT WELLESLEY, MA01102500: Flow=9.3cfs,Stage=6.17ft,2015-02-01 07:15,10-24,ABERJONA RIVER AT WINCHESTER, MA01332500: Flow=203cfs,Stage=5.66ft,Floodstage=9ft,2015-02-01 07:00,25-75,HOOSIC RIVER NEAR WILLIAMSTOWN, MA01331500: Flow=61cfs,Stage=5.96ft,2015-02-01 06:45,25-75,HOOSIC RIVER AT ADAMS, MA01199000: Flow=755cfs,Stage=2.94ft,Floodstage=7ft,2015-02-01 07:15,25-75,HOUSATONIC RIVER AT FALLS VILLAGE, CT01197500: Flow=544cfs,Stage=2.90ft,Floodstage=9ft,2015-02-01 06:30,25-75,HOUSATONIC RIVER NEAR GREAT BARRINGTON, MA01197000: Flow=58cfs,Stage=1.01ft,Floodstage=5ft,2015-02-01 06:30,25-75,EAST BRANCH HOUSATONIC RIVER AT COLTSVILLE, MA01186000: Flow=220cfs,Stage=4.03ft,2015-02-01 06:30,25-75,WEST BRANCH FARMINGTON RIVER AT RIVERTON, CT01184000: Flow=13800cfs,Stage=9.18ft,Floodstage=15ft,2015-02-01 06:30,25-75,CONNECTICUT RIVER AT THOMPSONVILLE, CT01183500: Flow=809cfs,Stage=4.68ft,Floodstage=13ft,2015-02-01 06:30,25-75,WESTFIELD RIVER NEAR WESTFIELD, MA01180500: Flow=62cfs,Stage=2.12ft,2015-02-01 06:30,25-75,MIDDLE BRANCH WESTFIELD RIVER AT GOSS HEIGHTS, MA01176000: Flow=332cfs,Stage=3.99ft,2015-02-01 07:15,25-75,QUABOAG RIVER AT WEST BRIMFIELD, MA01175500: Flow=53cfs,Stage=2.17ft,2015-02-01 07:15,25-75,SWIFT RIVER AT WEST WARE, MA01174500: Flow=83cfs,Stage=19.61ft,2015-02-01 06:30,25-75,EAST BRANCH SWIFT RIVER NEAR HARDWICK, MA01172500: Flow=138cfs,Stage=3.53ft,2015-02-01 06:30,25-75,WARE RIVER NEAR BARRE, MA01170500: Flow=9640cfs,Stage=10.25ft,Floodstage=28ft,2015-02-01 06:30,25-75,CONNECTICUT RIVER AT MONTAGUE CITY, MA01166500: Flow=683cfs,Stage=3.15ft,2015-02-01 07:00,25-75,MILLERS RIVER AT ERVING, MA01165000: Flow=61cfs,Stage=3.12ft,2015-02-01 06:30,25-75,EAST BRANCH TULLY RIVER NEAR ATHOL, MA01125000: Flow=139cfs,Stage=5.34ft,2015-02-01 06:30,25-75,FRENCH RIVER AT WEBSTER, MA01124500: Flow=27cfs,Stage=2.85ft,2015-02-01 06:30,25-75,LITTLE RIVER NEAR OXFORD, MA01123600: Flow=114cfs,Stage=3.94ft,2015-02-01 06:30,25-75,QUINEBAUG R BL WESTVILLE DAM NR SOUTHBRIDGE, MA01112500: Flow=632cfs,Stage=2.35ft,Floodstage=9ft,2015-02-01 06:30,25-75,BLACKSTONE RIVER AT WOONSOCKET, RI01110000: Flow=35cfs,Stage=1.50ft,2015-02-01 07:00,25-75,QUINSIGAMOND RIVER AT NORTH GRAFTON, MA01109070: Flow=21cfs,Stage=2.13ft,2015-02-01 06:45,25-75,SEGREGANSET RIVER NEAR DIGHTON, MA01109060: Flow=126cfs,Stage=3.14ft,2015-02-01 07:15,25-75,THREEMILE RIVER AT NORTH DIGHTON, MA01109000: Flow=61cfs,Stage=5.93ft,Floodstage=9.5ft,2015-02-01 07:15,25-75,WADING RIVER NEAR NORTON, MA01108000: Flow=504cfs,Stage=4.41ft,Floodstage=10.5ft,2015-02-01 06:45,25-75,TAUNTON RIVER NEAR BRIDGEWATER, MA01105870: Flow=34cfs,Stage=3.15ft,2015-02-01 07:15,25-75,JONES RIVER AT KINGSTON, MA01105600: Flow=10cfs,Stage=2.90ft,2015-02-01 07:00,25-75,OLD SWAMP RIVER NEAR SOUTH WEYMOUTH, MA01105500: Flow=42cfs,Stage=1.42ft,2015-02-01 07:15,25-75,EAST BRANCH NEPONSET RIVER AT CANTON, MA01105000: Flow=47cfs,Stage=6.22ft,Floodstage=9ft,2015-02-01 07:15,25-75,NEPONSET RIVER AT NORWOOD, MA01104000: Flow=78cfs,Stage=81.86ft,2015-02-01 07:15,25-75,MOTHER BROOK AT DEDHAM, MA01103500: Flow=260cfs,Stage=1.40ft,Floodstage=5ft,2015-02-01 06:45,25-75,CHARLES RIVER AT DOVER, MA01102000: Flow=128cfs,Stage=3.63ft,Floodstage=7ft,2015-02-01 07:00,25-75,IPSWICH RIVER NEAR IPSWICH, MA01101000: Flow=31cfs,Stage=2.05ft,2015-02-01 06:30,25-75,PARKER RIVER AT BYFIELD, MA01100600: Flow=34cfs,Stage=2.65ft,Floodstage=7ft,2015-02-01 06:30,25-75,SHAWSHEEN RIVER NEAR WILMINGTON, MA01099500: Flow=686cfs,Stage=5.45ft,Floodstage=8ft,2015-02-01 06:30,25-75,CONCORD R BELOW R MEADOW BROOK, AT LOWELL, MA01098530: Flow=139cfs,Stage=5.48ft,Floodstage=10ft,2015-02-01 07:15,25-75,SUDBURY RIVER AT SAXONVILLE, MA01097300: Flow=14cfs,Stage=3.77ft,2015-02-01 06:45,25-75,NASHOBA BROOK NEAR ACTON, MA01097000: Flow=200cfs,Stage=2.56ft,Floodstage=5ft,2015-02-01 07:15,25-75,ASSABET RIVER AT MAYNARD, MA01096500: Flow=542cfs,Stage=2.25ft,Floodstage=8ft,2015-02-01 06:30,25-75,NASHUA RIVER AT EAST PEPPERELL, MA01094500: Flow=138cfs,Stage=2.62ft,2015-02-01 07:15,25-75,NORTH NASHUA RIVER NEAR LEOMINSTER, MA422302071083801: Stage=15.95ft,2015-02-01 06:45,Not ranked,FRESH POND IN GATE HOUSE AT CAMBRIDGE, MA420259070105600: Stage=1.38ft,2015-02-01 06:30,Not ranked,PROVINCETOWN TIDE GAGE PROVINCETOWN,MA414507070091400: Stage=2.35ft,2015-02-01 07:00,Not ranked,SESUIT HARBOR TIDE GAGE AT DENNIS, MA413758070320501: Stage=44.17ft,2015-02-01 07:15,Not ranked,ASHUMET POND NEAR FALMOUTH, MA413601070275800: Stage=4.13ft,2015-02-01 07:15,Not ranked,POPPONESSET BAY, MASHPEE NECK RD, NEAR MASHPEE, MA011058837: Flow=20cfs,Stage=2.29ft,2015-02-01 07:15,Not ranked,QUASHNET RIVER AT WAQUOIT VILLAGE, MA011055566: Flow=376cfs,Stage=2.47ft,2015-02-01 06:45,Not ranked,NEPONSET RIVER AT MILTON VILLAGE, MA010965852: Stage=6.39ft,2015-02-01 07:15:00,Not ranked,Ice affected,BEAVER BROOK AT NORTH PELHAM, NH01198125: Flow=649cfs,Stage=3.46ft,2015-02-01 07:15,Not ranked,HOUSATONIC RIVER NEAR ASHLEY FALLS, MA01198000: Flow=76cfs,Stage=0.78ft,2015-02-01 06:30,Not ranked,GREEN RIVER NEAR GREAT BARRINGTON, MA01175670: Stage=10.38ft,2015-02-01 07:30:00,Not ranked,Ice affected,SEVENMILE RIVER NEAR SPENCER, MA01174565: Flow=11cfs,Stage=1.44ft,2015-02-01 07:00,Not ranked,WEST BRANCH SWIFT RIVER NEAR SHUTESBURY, MA01173500: Stage=3.23ft,2015-02-01 06:45:00,Not ranked,Ice affected,WARE RIVER AT GIBBS CROSSING, MA01172010: Flow=14600cfs,Stage=9.20ft,Floodstage=26.5ft,2015-02-01 06:30,Not ranked,CONNECTICUT R AT I-391 BRIDGE AT HOLYOKE, MA01171500: Stage=7.08ft,2015-02-01 07:15:00,Floodstage=11ft,Not ranked,Ice affected,MILL RIVER AT NORTHAMPTON, MA01170100: Stage=4.11ft,2015-02-01 07:15:00,Not ranked,Ice affected,GREEN RIVER NEAR COLRAIN, MA01169900: Stage=6.60ft,2015-02-01 07:00:00,Not ranked,Ice affected,SOUTH RIVER NEAR CONWAY, MA01169000: Stage=2.48ft,2015-02-01 06:30:00,Floodstage=9ft,Not ranked,Ice affected,NORTH RIVER AT SHATTUCKVILLE, MA01168250: Stage=3.80ft,2015-02-01 06:30,Not ranked,COLD RIVER AT FLORIDA, MA01164000: Stage=6.07ft,2015-02-01 06:30:00,Not ranked,Ice affected,MILLERS RIVER AT SOUTH ROYALSTON, MA01163500: Flow=285cfs,Stage=2.19ft,2015-02-01 06:30,Not ranked,MILLERS R BL BIRCH HILL DAM AT SOUTH ROYALSTON, MA01163200: Stage=1.22ft,2015-02-01 07:15:00,Not ranked,Ice affected,OTTER RIVER AT OTTER RIVER, MA01162500: Stage=2.80ft,2015-02-01 06:45:00,Not ranked,Ice affected,PRIEST BROOK NEAR WINCHENDON, MA01162000: Stage=4.67ft,2015-02-01 07:00:00,Not ranked,Ice affected,MILLERS RIVER NEAR WINCHENDON, MA01161000: Stage=5.36ft,2015-02-01 06:45:00,Not ranked,Ice affected,ASHUELOT RIVER AT HINSDALE, NH01124350: Flow=42cfs,Stage=1.39ft,2015-02-01 06:30,Not ranked,FRENCH RIVER BELOW DAM, AT HODGES VILLAGE, MA01124000: Stage=4.94ft,2015-02-01 07:00:00,Not ranked,Ice affected,QUINEBAUG RIVER AT QUINEBAUG, CT01123360: Flow=95cfs,Stage=3.17ft,2015-02-01 07:00,Not ranked,QUINEBAUG R BL E BRIMFIELD DAM AT FISKDALE, MA01113895: Flow=558cfs,Stage=1.22ft,2015-02-01 07:15,Not ranked,BLACKSTONE R AT ROOSEVELT ST AT PAWTUCKET RI01111230: Stage=3.30ft,2015-02-01 07:00,Not ranked,BLACKSTONE RIVER AT MILLVILLE, MA01111212: Flow=415cfs,Stage=8.00ft,2015-02-01 07:00,Not ranked,BLACKSTONE RIVER, RT 122 BRIDGE NEAR UXBRIDGE, MA01109730: Flow=91cfs,Stage=1.78ft,2015-02-01 07:00,Not ranked,BLACKSTONE RIVER, W. MAIN ST., AT MILLBURY, MA01109403: Flow=82cfs,Stage=2.89ft,2015-02-01 05:15,Not ranked,TEN MILE R., PAWTUCKET AVE. AT E. PROVIDENCE, RI01108410: Flow=125cfs,Stage=4.59ft,Floodstage=8.5ft,2015-02-01 07:00,Not ranked,MILL RIVER AT SPRING STREET AT TAUNTON, MA01105933: Flow=44cfs,Stage=9.53ft,2015-02-01 07:15,Not ranked,PASKAMANSET RIVER NEAR SOUTH DARTMOUTH, MA01105880: Flow=17cfs,Stage=2.42ft,2015-02-01 07:00,Not ranked,HERRING RIVER AT NORTH HARWICH, MA01105876: Stage=6.79ft,2015-02-01 07:15:00,Not ranked,Very rapid increase,EEL RIVER AT RT 3A NEAR PLYMOUTH, MA01105638: Stage=1.73ft,2015-02-01 06:30,Not ranked,WEIR RIVER AT LEAVITT STREET AT HINGHAM, MA01105608: Flow=23cfs,Stage=31.97ft,2015-02-01 06:45,Not ranked,WHITMANS POND FISH LADDER AT EAST WEYMOUTH, MA01105607: Stage=65.32ft,2015-02-01 07:15,Not ranked,WHITMANS POND FLOOD BY-PASS AT EAST WEYMOUTH, MA01105606: Flow=27cfs,Stage=72.87ft,2015-01-31 11:15,Not ranked,WHITMANS POND, WHITMANS POND DAM AT E. WEYMOUTH,MA01105585: Flow=5.6cfs,Stage=1.83ft,2015-02-01 07:00,Not ranked,TOWN BROOK AT QUINCY, MA01105584: Stage=16.70ft,2015-02-01 07:00,Not ranked,TOWN BROOK AT DIVERSION TUNNEL AT QUINCY, MA01105583: Stage=4.16ft,2015-02-01 07:00:00,Not ranked,Ice affected,MONATIQUOT RIVER AT EAST BRAINTREE, MA01105554: Flow=143cfs,Stage=8.54ft,2015-02-01 06:30,Not ranked,NEPONSET RIVER AT GREENLODGE ST NEAR CANTON, MA01104715: Stage=106.91ft,2015-02-01 07:00,Not ranked,CHARLES RIVER, NEW CHARLES RIVER DAM AT BOSTON, MA01104705: Stage=106.95ft,2015-02-01 07:00,Not ranked,CHARLES RIVER AT FIRST ST AT CAMBRIDGE, MA01104683: Stage=7.51ft,2015-02-01 07:00,Not ranked,MUDDY RIVER AT BROOKLINE, MA01104501: Flow=7.5cfs,Stage=2.08ft,2015-02-01 07:00,Not ranked,BEAVER BROOK, LINDEN STREET, AT WALTHAM, MA01104480: Flow=12cfs,Stage=1.10ft,2015-02-01 06:00,Not ranked,STONY BROOK RESERVOIR AT DAM NEAR WALTHAM, MA01104475: Flow=0.83cfs,Stage=0.50ft,2015-02-01 06:30,Not ranked,STONY BROOK RES., UNNAMED TRIB 1, NEAR WESTON, MA01104460: Flow=25cfs,Stage=5.30ft,2015-02-01 06:00,Not ranked,STONY BROOK AT RT 20 AT WALTHAM, MA01104455: Flow=0.18cfs,Stage=3.14ft,2015-02-01 06:30,Not ranked,STONY BROOK, UNNAMED TRIBUTARY 1, NEAR WALTHAM, MA01104453: Flow=3.8cfs,Stage=96.35ft,2015-02-01 06:40,Not ranked,STONY BROOK UNNAMED TRIB 2 NR WESTON STATION01104430: Flow=7.7cfs,Stage=0.81ft,2015-02-01 06:30,Not ranked,HOBBS BK BELOW CAMBRIDGE RES NR KENDALL GREEN, MA01104420: Stage=1.26ft,2015-02-01 06:30,Not ranked,CAMBRIDGE RES., UNNAMED TRIB 3, NR LEXINGTON, MA01104415: Flow=0.22cfs,Stage=0.68ft,2015-02-01 06:15,Not ranked,CAMBRIDGE RES., UNNAMED TRIB 2, NR LEXINGTON, MA01104405: Flow=5.2cfs,Stage=1.20ft,2015-02-01 06:40,Not ranked,HOBBS BROOK AT MILL ST NR LINCOLN, MA01104370: Flow=8.1cfs,Stage=0.79ft,2015-02-01 06:40,Not ranked,STONY BROOK AT VILES STREET, NEAR WESTON, MA01103455: Stage=1.65ft,2015-02-01 07:00,Not ranked,TROUT BROOK AT DOVER, MA01103280: Flow=79cfs,Stage=1.35ft,Floodstage=5ft,2015-02-01 06:45,Not ranked,CHARLES RIVER AT MEDWAY, MA01103050: Stage=104.92ft,2015-02-01 06:45,Not ranked,MYSTIC R AT AMELIA EARHART DAM NR SOMERVILLE, MA01103025: Flow=8.2cfs,Stage=1.54ft,2015-02-01 07:15,Not ranked,ALEWIFE BROOK NEAR ARLINGTON, MA01102345: Flow=32cfs,Stage=2.29ft,2015-02-01 07:00,Not ranked,SAUGUS RIVER AT SAUGUS IRONWORKS AT SAUGUS, MA01101500: Stage=1.56ft,2015-02-01 06:30:00,Not ranked,IPSWICH RIVER AT SOUTH MIDDLETON, MA01100870: Stage=65.85ft,2015-02-01 07:00,Not ranked,MERRIMACK RIVER AT NEWBURYPORT, MA01100693: Stage=7.16ft,Floodstage=15ft,2015-02-01 07:15,Not ranked,MERRIMACK R 0.3 MILES U.S.RT 125 AT HAVERHILL,MA01100627: Flow=117cfs,Stage=26.95ft,2015-02-01 06:30,Not ranked,SHAWSHEEN RIVER AT BALMORAL STREET AT ANDOVER, MA01100568: Flow=3.1cfs,Stage=0.76ft,2015-02-01 05:15,Not ranked,SHAWSHEEN RIVER AT HANSCOM FIELD NEAR BEDFORD, MA01100561: Flow=78cfs,Stage=3.76ft,Floodstage=8ft,2015-02-01 06:30,Not ranked,SPICKET RIVER NEAR METHUEN, MA01100505: Flow=171cfs,Stage=4.86ft,2015-02-01 06:30,Not ranked,SPICKET RIVER AT NORTH SALEM, NH01100500: Stage=12.22ft,2015-02-01 06:30,Not ranked,MERRIMACK RIVER AT LAWRENCE, MA01098500: Flow=20cfs,Stage=4.44ft,2015-02-01 07:00,Not ranked,COCHITUATE BK BL LAKE COCHITUATE AT FRAMINGHAM, MA01098499: Stage=8.24ft,2015-02-01 07:00,Not ranked,LAKE COCHITUATE AT FRAMINGHAM, MA01096000: Stage=2.39ft,2015-02-01 07:00:00,Floodstage=7ft,Not ranked,Ice affected,SQUANNACOOK RIVER NEAR WEST GROTON, MA01095503: Flow=153cfs,Stage=2.42ft,2015-02-01 07:00,Not ranked,NASHUA RIVER, WATER STREET BRIDGE, AT CLINTON, MA01095434: Not ranked,Rating being developed or revised,GATES BROOK NEAR WEST BOYLSTON, MA01095375: Flow=149cfs,Stage=8.19ft,2015-02-01 07:00,Not ranked,QUINAPOXET RIVER AT CANADA MILLS NEAR HOLDEN, MA01095220: Flow=36cfs,Stage=4.73ft,2015-02-01 07:00,Not ranked,STILLWATER RIVER NEAR STERLING, MA01094400: Stage=2.23ft,2015-02-01 06:30:00,Floodstage=6.5ft,Not ranked,Ice affected,NORTH NASHUA RIVER AT FITCHBURG, MAGo to WaterWatch (offsite) for a larger map with additional options
[color code for] High
[color code for] > 90th percentile
[color code for] 76th - 90th percentile
[color code for] 25th - 75th percentile
[color code for] 10th - 24th percentile
[color code for] < 10th percentile
[color code for] Low
[color code for] Not ranked
The colored dots on this map depict streamflow conditions as a percentile, which is computed from the period of record for the current day of the year. Only stations with at least 30 years of record are used.
The gray circles indicate other stations that were not ranked in percentiles either because they have fewer than 30 years of record or because they report parameters other than streamflow. Some stations, for example, measure stage only.

Statewide Streamflow Table

Current data typically are recorded at 15- to 60-minute intervals, stored onsite, and then transmitted to USGS offices every 1 to 4 hours, depending on the data relay technique used. Recording and transmission times may be more frequent during critical events. Data from current sites are relayed to USGS offices via satellite, telephone, and/or radio telemetry and are available for viewing within minutes of arrival.

All real-time data are provisional and subject to revision.

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