About this Dataset

12 Digit Watersheds

This file (SWSHED12) is a statewide digital watershed file. It was created primarily for state and federal agency use. The watersheds define Strahler (Strahler 1952 p. 1120) third order stream drainage by contours on U.S. Geological Survey (USGS) 7.5 minute quadrangle map sheets. Some watersheds drainage areas were defined for streams less than third order and some large area watershed were split to maintain a maximum size of 15,000 acres. The watershed boundaries in this file were developed in a joint state and federal effort to create a consistent watershed file for use by all government agencies with an interest in Maryland's watersheds. The U.S. Natural Resources Conservation Service (NRCS) redefined the third order watersheds creating the HUA14 file. This file contains all of the HUA14 watersheds and some added watersheds to maintain water quality sampling sites. It was also used to create the Maryland Sub-Watershed file.
Organization: State of Maryland
Last updated: 2025-07-26T19:57:54.056370

Tables

Table 1

@usgov.state_of_maryland_12_digit_watersheds.table_1

6.23 MB
1,136 rows
14 columns

CREATE TABLE table_1 (
  "the_geom" VARCHAR,
  "gis_object_id" BIGINT,
  "mde_6_digit_watershed_number" BIGINT,
  "mde_6_digit_watershed_name" VARCHAR,
  "mde_8_digit_watershed_number" BIGINT,
  "mde_8_digit_watershed_name" VARCHAR,
  "dnr_12_digit_watershed_number" BIGINT,
  "tributary_strategy_name" VARCHAR,
  "hua_14_digit" VARCHAR,
  "hua_11_digit" VARCHAR,
  "hua_8_digit" VARCHAR,
  "combined_index_of_biotic_integrity" DOUBLE,
  "shape_starea" DOUBLE  -- Shape.STArea(),
  "shape_stlength" DOUBLE  -- Shape.STLength()
);