March 2010

Download these layers (52 MB)
ESRI Shapefiles with ArcGIS 9 LYR file and ArcView 3x AVLs (52 MB)
PALIS and SARIS lookup tables (.zip file with two .dbfs)

Overview

The MassDEP Hydrography layer is an enhanced version of the older U.S. Geological survey 1:25,000 Hydrography datalayer. It represents hydrographic (water-related) features, including surface water (lakes, ponds, and reservoirs), wetlands, bogs, flats, rivers, streams, and others (see below).

The layer is a hybrid of data based on USGS Digital Line Graphs (DLGs), scanned mylar separates obtained from the USGS, digitized hydrographic features from paper USGS 1:25,000 Topographic Quadrangle maps and data extracted from the MassDEP Wetlands datalayer. Areas within many surface water supply watersheds have been enhanced by using higher resolution streams and lakes from the MassDEP Wetlands datalayer, many areas have also been field verified. This layer is intended as an interim product that will be incorporated into the USGS’s National Hydrography Dataset (NHD) when funding and resources become available. If you are interested in providing data, funding, field work, or becoming part of an NHD working group, please contact Brian Brodeur of the MassDEP GIS Program by email at Brian.Brodeur@state.ma.us.

Available statewide, the hydrography (arc and polygon feature classes) is stored in ArcSDE as HYDRO25K_POLY and HYDRO25K_ARC.

Production

The DLG quadrangles were converted into Arc/INFO coverages and projected into the Massachusetts State Plane Coordinate System. The long list of items (MAJOR1, MINOR1, MAJOR2, MINOR2...) was then concatenated to a more simplified coding system. For each feature MINORn was truncated to three characters and linked to the other minor codes to create MINOR_TOT. For example, a submerged (612) wetland (111) is now coded MINOR_TOT = 612111. The original MAJORn, MINORn pairs are no longer part of the attribute tables.

Quadrangles covering Nantucket and Martha’s Vineyard were completely digitized from the 1:25,000 USGS quadrangles. Though not as thoroughly coded as the 1:25,000 DLGs, the linework is all at 1:25,000.

The scanned quadrangles were automated in-house by scanning USGS mylar separates at 500 dots per inch. The resulting images were vectorized in GRID and then edited in ARCEDIT. Features missing from the blue line separate (i.e. dams or man-made shore) were digitized from the paper quadrangles.

Four quads along the Massachusetts-Connecticut border were obtained from the Connecticut DEP and projected to the Massachusetts State Plane Coordinate System. See the table below for details on the source of each quad.

An ongoing project by the MassDEP GIS Program to redelineate surface water supply watersheds using digital terrain models is adding additional streams within the newly delineated watersheds. These streams are from the MassDEP Wetlands datalayer with some additional on screen digitizing from the 2005 Color OrthoPhotos. Streams added from this process are generally coded as intermittent unless field verification proves otherwise. In 2007 the outlines of all reservoirs were replaced with those from the MassDEP Wetlands datalayer so either dataset can be used with the SWP Zones datalayer. In 2008 field verified streams for the Wachusett Reservoir watershed were provided by DCR West Boylston GIS staff and added.
Sample of Existing USGS 1:25000 Hydrography
Existing USGS 1:25000 Hydrography
Sample of Hydrologic Connections from DEP Wetlands
Hydrologic Connections from DEP Wetlands
Sample of MassDEP Hydrography with Local Resolution Streams
MassDEP Hydrography with Local Resolution Streams

Editing

All of the digitized quadrangles were checkplotted at 1:25,000. The 1:25,000 DLG quadrangles were randomly checkplotted. Each of the quadrangles was edgematched to its neighboring quads. The scanned hydrography was compared both to the source mylar and to the paper quadrangles to ensure completeness.

For the December 2003 update, the layer was extracted from the Quad library and dissolved into a single coverage, which was dissolved on all items after the SOURCE field was dropped. Most slivers, gaps, and other artifacts left over from the quad tiling scheme were removed. Some codes were also refined. Edits were preformed by MassGIS and Department of Environmental Protection (DEP) GIS Group staff.

The high resolution streams from the DEP Wetlands datalayer were field verified and edited mostly in the upper reaches of the watersheds where they crossed roads or if the natural flow wasn’t apparent.

Attributes

The layer contains both a polygon and arc feature class. The modified DLG coding scheme is extensive and includes a wide variety of features, including ponds, cranberry bogs, impoundments, wetlands, tidal flats, dams, streams, and aqueducts. Only data from the DLGs have been coded this completely. Data from other sources have been coded to include ponds and streams and in the case of data from the scanned quads, wetlands.

Pond and Lake Identification System (PALIS) IDs are unique codes which were added to ponds and lakes by  DEP GIS in conjunction with the DEP Division of Watershed Management using identification codes developed by the Pond and Lakes Information System. For historical reasons, some wetland polygons have PALIS IDs. PALIS IDs were also given to impoundment areas along rivers and when necessary closure lines were added.

Since the data now comes from different sources, the attribute SOURCE was added to differentiate which program/entity provided the feature. An attribute for the approximate NHD resolution was added to aid in future input into NHD.

The items in the polygon attribute table are:

MINOR_TOT Text (15) Concatenated feature code
POLY_CODE
 
Number (10)
 

 
Generalized code based on MINOR_TOT simplified to these 9 codes:
 0 - LAND/ISLAND/DAM/AQUEDUCT
 1 - RESERVOIR (with PWSID)
 2 - WETLAND, MARSH, SWAMP, BOG
 3 - SUBMERGED WETLANDS
 4 - CRANBERRY BOG
 5 - SALT WETLANDS
 6 - LAKE, POND, WIDE RIVER, IMPOUNDMENT
 7 - TIDAL FLATS, SHOALS
 8 - BAY, OCEAN
 9 - INUNDATED AREA
PWSID Text (11) DEP public water supply identification number
PALIS_ID Number (6) A unique ID from the Ponds and Lakes Information System
SOURCE
 
Text (12)
 

 
Program Source for the feature:
 USGS/MGIS – Original 1:25,000 Hydrography
 DEPGIS – Added from DEP Wetlands by DEP GIS staff
 DCRGIS – From DEP Wetlands and edits/verified by DCR staff
MINOR_NUM Number (15) Same as MINOR_TOT, as integer
RESOLUTION
 
Text (12)
 

 
NHD corresponding resolution:
 HIGH - Nominally > 1:25,000
 LOCAL - < 1:25,000, nominally 1:12,000, some at 1:5,000
The items in the arc attribute table are:
MINOR_TOT  Text (12) Concatenated feature code
ARC_CODE
 
Number (10)
 
Generalized code based on MINOR_TOT simplified to these codes:
   1 - SHORELINE
   2 - CLOSURE LINE
   3 - APPARENT WETLAND LIMIT
   4 - STREAM
   5 - INTERMITTENT STREAM
   6 - DITCH, CANAL
   7 - AQUEDUCT
   8 - DAM
   9 - INTERMITTENT/INDEFINITE SHORELINE
 10 - MAN-MADE SHORELINE
 11 - CHANNEL IN WATER
 99 - TRANSPORT ARC
   0 - UNKNOWN
PWSID Text (11) DEP public water supply identification number
SOURCE
 
Text (12)
 

 
Program Source for the feature:
 USGS/MGIS – Original 1:25,000 Hydrography
 DEPGIS – Added from DEP Wetlands by DEP GIS staff
 DCRGIS – From DEP Wetlands and edits/verified by DCR staff
MINOR_NUM Number (12)  Same as MINOR_TOT, as integer
RESOLUTION Text (12)
 
NHD corresponding resolution:
 HIGH - Nominally > 1:25,000
 LOCAL - < 1:25,000, nominally 1:12,000, some at 1:5,000
The following table lists all the possible MINOR_TOT/MINOR_NUM codes for a POLYGON FEATURE. These codes have been extracted and concatenated from the USGS DLG major/minor pairs.
MINOR_TOT/NUM DESCRIPTION
101 RESERVOIR
102 COVERED RESERVOIR
105 INUNDATION AREA
106 FISH HATCHERY/FARM
107 INDUST WATER IMPOUND
109 SEWAGE DISP POND
111 MARSH/WETLAND
114 CRANBERRY BOG
115 FLATS
116 BAY/ESTUARY/GULF
124 FILTRATION POND
400 RAPIDS
401 FALLS
402 GRAVEL PIT W/WATER
404 PUMPING STATION
406 DAM/WEIR
408 SPILLWAY
410 ROCK
412 STREAM
414 DITCH/CANAL
415 AQUEDUCT
416 FLUME
419 CHANNEL IN WATER
421 LAKE OR POND
422 CORAL REEF
999 LAND/ISLAND
7105 INUNDATION AREA
7111 MARSH/WETLAND
101619 RESERVOIR
101625 RESERVOIR
102111 COV RESERVOIR/MARSH
105007 INUNDATION AREA
105111 INUN AREA/MARSH
109421 SEWAGE POND/POND
109611 SEWAGE POND-ABAND
109619 SEWAGE POND
111007 MARSH/WETLAND
111105 MARSH/INUN AREA
111114 MARSH/CRANBERRY BOG
111608 MARSH-SALT
111612 MARSH-SUBMERGED
114007 CRANBERRY BOG
114111 CRANBERRY BOG/MARSH
115007 FLATS
115020 FLATS
115116 FLATS/BAY
115410 FLATS/ROCK
115412 FLATS/STREAM
115421 FLATS/POND
 
MINOR_TOT/NUM DESCRIPTION
115422 FLATS/CORAL REEF
115616 FLATS-NAVIGABLE
406618 DAM-EARTHEN
410115 ROCKS/FLATS
412111 STREAM/MARSH
412115 STREAM FLATS
412612 STREAM-SUNKEN
415604 AQUEDUCT IN TUNNEL
419115 CHANNEL FLATS
419616 CHANNEL-NAVIGABLE
421007 LAKE OR POND
421101 POND/RESERVOIR
421111 POND WETLAND
421609 UNSURVEYED POND
421610 POND-INTERMITTENT
421612 POND-SUNKEN
421618 POND-EARTHEN
421619 LAKE OR POND
421625 LAKE OR POND
421628 LAKE OR POND
422115 CORAL REEF/FLATS
610402 INTERMIT PIT W/WATER
610421 INTERMITTENT POND
612111 SUBMERGED MARSH
619101 RESERVOIR
619412 STREAM
619421 LAKE OR POND
101111612 SUBMERGED RES MARSH
101619625 RESERVOIR
105007111 INUN AREA/MARSH
105111007 INUN AREA/MARSH
111007105 MARSH/INUN AREA
111007612 MARSH-SUBMERGED
111007625 MARSH/WETLAND
111105007 MARSH/INUN AREA
111114007 MARSH/CRANBERRY BOG
111612007 MARSH-SUBMERGED
111612421 POND MARSH-SUBMERGED
111612619 MARSH-SUBMERGED
111612625 MARSH-SUBMERGED
114007111 CRANBERRY BOG/MARSH
114111007 CRANBERRY BOG/MARSH
421111007 POND MARSH
421619625 LAKE OR POND
421625619 LAKE OR POND
619625415 AQUEDUCT
619625421 LAKE OR POND
101111612625 RES MARSH-SUBMERGED
The following table lists all the possible MINOR_NUM/MINOR_TOT codes for an ARC FEATURE. These codes have been extracted and concatenated from the USGS DLG major/minor pairs.
MINOR_TOT/NUM DESCRIPTION
109 SEWAGE DISP/FILT BED
200 SHORELINE
201 MANMADE SHORELINE
202 CLOSURE LINE
203 INDEFINITE SHORELINE
204 APPARENT LIMIT
210 TRANSPORT ARC
300 SPRING
401 FALLS
405 WATER INTAKE
406 DAM/WEIR
407 CANAL LOCK
408 SPILLWAY
409 GATE
412 STREAM
414 DITCH/CANAL
415 AQUEDUCT
416 FLUME
419 CHANNEL IN WATER
422 CORAL REEF
605 RIGHT BANK
606 LEFT BANK
999 UNKNOWN OR NEAT LINE
7204 APPARENT LIMIT
9606 LEFT BANK
200009 SHORELINE
200201 MANMADE SHORELINE
200606 LEFT BANK/SHORE
200610 INTERMITTENT SHORE
201002 MANMADE SHORELINE
201009 MANMADE SHORELINE
201020 MANMADE SHORELINE
201605 MANMADE RIGHT BANK
201606 MANMADE LEFT BANK
202412 CLOSURE LINE/STREAM
203625 INDEFINITE SHORE
203627 INDEFINITE SHORE
204007 APPARENT LIMIT
204009 APPARENT LIMIT
406009 DAM/WEIR
406017 DAM/WEIR
406200 DAM/SHORE
 
MINOR_TOT/NUM DESCRIPTION
406618 DAM/WEIR-EARTHEN
412007 STREAM
412009 STREAM
412020 STREAM
412202 STREAM CLOSURE LINE
412601 STREAM-UNDERGROUND
412604 STREAM-TUNNEL
412609 STREAM-UNSURVEYED
412610 STREAM-INTERMITTENT
414009 DITCH/CANAL
414017 DITCH/CANAL
414610 CANAL-INTERMITTENT
414611 CANAL-ABANDONED
415412 AQUEDUCT/STREAM
415601 AQUEDUCT-UNDERGROUND
415604 AQUEDUCT-TUNNEL
415605 AQUEDUCT RIGHT BANK
415611 AQUEDUCT-ABANDONED
415612 AQUEDUCT-SUBMERGED
601412 UNDERGROUND STREAM
605009 RIGHT BANK
605201 RIGHT BANK-MANMADE
606009 LEFT BANK
606201 LEFT BANK-MANMADE
610200 INTERMITTENT SHORE
610412 INTERMITTENT STREAM
610414 INTERMITTENT CANAL
610421 INTERMITTENT POND
200618406 SHORE/EARTHEN DAM
201009020 MANMADE SHORE
201020002 MANMADE SHORE
201020605 MANMADE RIGHT BANK
201605020 MANMADE RIGHT BANK
201606009 MANMADE LEFT BANK
201606020 MANMADE LEFT BANK
202412617 CLOS LINE/STR UNDERP
406009017 DAM/WEIR
406618017 DAM-EARTHEN
406618200 DAM-EARTHEN/SHORE
412610009 STREAM-INTERMITTENT
412610202 INT STREAM CLOSURE
412610617 INT STRM UNDERPASS

Source of 1:25,000 Hydrography from USGS
Source is for features coded as "USGS/MGIS" in the SOURCE field. Some of these features may have been modified by on-screen digitizing and/or enhanced with data from the MassDEP Wetlands (1:12,000) layer. See the SOURCE fields in the polygon and arc layers for specific sources. Also see the status map pdf format of    st_hd.pdf  for the pre-MassDEP-enhanced hydrography data.

(USGS QUAD# - SOURCE)
Source Key:
  DLG = USGS Digital Line Graph
  SCN = Scanned USGS mylar
  DIG = Digitized from 1:25,000 USGS topographic maps
  CNR = Data from Connecticut modified by MassGIS

1 - DLG
2 - SCN
3 - SCN
4 - DLG
5 - DLG
6 - DLG
7 - DLG
8 - SCN
9 - SCN
10 - DLG
11 - SCN
12 - SCN
13 - SCN
14 - SCN
15 - SCN
16 - DLG
17 - SCN
18 - SCN
19 - SCN
20 - SCN
21 - SCN
22 - DLG
23 - SCN
24 - SCN
25 - SCN
26 - SCN
27 - SCN
28 - DLG
29 - SCN
30 - SCN
31 - SCN
32 - SCN
33 - SCN
34 - DLG
35 - SCN
36 - SCN
37 - SCN
38 - SCN
39 - SCN
40 - CNR
41 - SCN
42 - SCN
43 - SCN
44 - SCN
45 - SCN
46 - CNR
47 - DLG
48 - SCN
49 - SCN
50 - SCN
51 - SCN
52 - CNR
53 - DLG
54 - SCN
55 - SCN
56 - SCN
57 - SCN
58 - CNR
59 - DLG
60 - SCN
61 - SCN
62 - SCN
63 - SCN
64 - DLG
65 - DLG
66 - SCN
67 - SCN
68 - SCN
69 - SCN
70 - DLG
71 - DLG
72 - DLG
73 - DLG
74 - DLG
75 - DLG
76 - DLG
77 - DLG
78 - DLG
79 - DLG
80 - DLG
81 - DLG
82 - DLG
83 - DLG
84 - DLG
85 - DLG
86 - DLG
87 - DLG
88 - SCN
89 - DLG
90 - DLG
91 - DLG
92 - DLG
93 - DLG
94 - SCN
95 - DLG
96 - DLG
97 - SCN
98 - SCN
99 - SCN
100 - SCN
101 - SCN
102 - DLG
103 - DLG
104 - SCN
105 - SCN
106 - SCN
107 - SCN
108 - SCN
109 - DLG
110 - DLG
111 - DLG
112 - DLG
113 - DLG
114 - SCN
115 - SCN
116 - SCN
117 - SCN
118 - SCN
119 - DLG
120 - DLG
121 - DLG
121-S - DLG
122 - DLG
123 - DLG
124 - DLG
125 - SCN
126 - SCN
127 - SCN
128 - SCN
129 - SCN
130 - DLG
131 - DLG
132 - DLG
132-S - DLG
133 - DLG
134 - DLG
135 - DLG
136 - DLG
137 - DLG
138 - DLG
139 - DLG
140 - DLG
141 - SCN
142 - SCN
143 - SCN
144 - DLG
145 - DIG
146 - DLG
147 - DLG
148 - DLG
149 - DLG
150 - DLG
151 - DLG
152 - DLG
153 - SCN
154 - SCN
155 - SCN
156 - DLG
157 - DIG
158 - DIG
158-S - DIG
159-E - DLG
159-W - DLG
160 - DLG
161 - DLG
161-E - DLG
162 - DLG
163 - DLG
164 - DLG
165 - DLG
166 - DIG
167 - DIG
168-E - DLG
168-W - DLG
169 - DLG
170 - DLG
171 - DLG
172 - DLG
173 - DIG
173-E - DIG
173-S - DIG
173-SE - DIG
174 - DLG
174-N - DLG
175 - DLG
176 - DLG
176-S - DLG
177 - DIG
178 - DLG
179 - DLG
179-N - DLG
180 - DIG
180-S - DIG
181 - DLG
182 - DLG
182-E - DLG
183 - DLG
184 - DLG
184-N - DLG
185 - DLG
186 - DLG
186-W - DLG
187 - DIG
187-E - DIG
188 - DIG
188-E - DIG
188-S - DIG
188-SE - DIG
189 - DLG
Note that these hydrography layers do not have feature names (e.g., "Quabbin Reservoir" or "Connecticut River") as attributes. To label the features in these layers, use the annotation in the HYDRO subclass of the Geographic Place Names layer.

Maintenance

The MassDEP GIS Program maintains the MassDEP Hydrography layers.

The 2007 update includes new streams within the watersheds of active sources in Lynn, Peabody, Danvers, Middleton, Beverly, Manchester, and Ipswich.

The 2008 update includes new streams within the watersheds of active sources in Gloucester, Rockport, Ipswich, Newburyport, Amesbury, Haverhill, Andover, North Andover, Wakefield, Winchester, Woburn, Burlington, Lincoln, Concord, Leominster, Fitchburg, Worcester, Greenfield and the entire Wachusett Reservoir watershed. Please refer to the SWP Watersheds and SWP Zones datalayers for additional information on this project.

The 2009 update (released in March 2010) includes new streams within the watersheds of active and inactive sources in Ashburnham, Winchendon, Gardner, Fitchburg (North), Hudson, Marlborough, Westboro, Milford, Braintree, Hingham, Weymouth, Abington, Rockland, Brockton, Attleboro, Somerset, Fall River, Falmouth, Plymouth, Wareham, New Bedford, Taunton, and Cambridge. The code for closure lines was split into 2 different codes, where arc_code = 2 was assigned to features between tidal flats and bay/ocean, and arc_code = 12 was assigned to closure lines between different types of wetlands features. A minor_tot of 7204 was given to the tidal flat features. Some changes were made to the Quabbin Reservoir and tributaries, along with some covered reservoirs in Weston, Milton and Medford, at the request of the MWRA GIS Program. A general cleanup was also performed to address logical errors in the original dataset, like a stream inside an open water feature or a pond surrounded by a wetland line feature.

For other hydrographic features, also see the DEP Wetlands (1:12,000) , Hydrography (1:100,000) and Major Ponds and Major Streams layers.


Last Updated 3/15/2013