Latitude: 42.353900° N,
Longitude: 71.050300° W,
Horizontal Datum:
NAD83
River Stage
Reference Frame |
Gauge Height |
Flood Stage |
Uses |
| NWS stage |
0 ft |
12.5 ft |
Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps |
| Vertical Datum |
Elevation
(gauge height = 0) |
Elevation
(gauge height = flood stage) |
Elevation information source |
| NAVD88 |
-5.51 |
6.99 |
Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps |
| NGVD 29 |
Not Available |
Not Available |
Older USGS topographic maps, NGVD29 benchmarks |
| MSL |
-5.21 |
7.29 |
Older USGS topographic maps, MSL benchmarks |
| Other |
Not Available |
12.5 |
MLLW (Mean Lower Low Water) |
|