ESI Rank | Estuarine | Lacustrine | Riverine |
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1A | Exposed rocky shores | Exposed rocky shores | Exposed rocky banks |
1B | Exposed, solid man-made structures | Exposed, solid man-made structures | Exposed, solid man-made structures |
1C | Exposed rocky cliffs with boulder talus base | Exposed rocky cliffs with boulder talus base | Exposed rocky cliffs with boulder talus base |
2A | Exposed wave-cut platforms in bedrock, mud, or clay | Shelving bedrock shores | Rocky shoals, bedrock ledges |
2B | Exposed scarps and steep slopes in clay | | |
3A | Fine to medium-grained sand beaches | | |
3B | Scarps and steep slopes in sand | Eroding scarps in unconsolidated sediment | Exposed, eroding banks in unconsolidated sediments |
3C | Tundra cliffs | | |
4 | Coarse-grained sand beaches | Sand beaches | Sandy bars and gently sloping banks |
5 | Mixed sand and gravel beaches | Mixed sand and gravel beaches | Mixed sand and gravel bars and gently sloping banks |
6A | Gravel beaches
Gravel beaches (granules and pebbles)* | Gravel beaches | Gravel bars and gently sloping banks |
6B | Riprap
Gravel beaches (cobbles and boulders)* | Riprap | Riprap |
6C* | Riprap | | |
7 | Exposed tidal flats | Exposed tidal flats | |
8A | Sheltered scarps in bedrock, mud, or clay
Sheltered rocky shores (impermeable)* | Sheltered scarps in bedrock, mud, or clay | |
8B | Sheltered, solid man-made structures
Sheltered rocky shores (permeable)* | Sheltered, solid man-made structures | Sheltered, solid man-made structures |
8C | Sheltered riprap | Sheltered riprap | Sheltered riprap |
8D | Sheltered rocky rubble shores | | |
8E | Peat shorelines | | |
8F | | | Vegetated, steeply-sloping bluffs |
9A | Sheltered tidal flats | Sheltered sand/mud flats | |
9B | Vegetated low banks | Vegetated low banks | Vegetated low banks |
9 | Hypersaline tidal flats | | |
10A | Salt- and brackish-water marshes | | |
10B | Freshwater marshes | Freshwater marshes | Freshwater marshes |
10C | Swamps | Swamps | Swamps |
10D | Scrub-shrub wetlands; Mangroves** | Scrub-shrub wetlands | Scrub-shrub wetlands |
10E | Inundated low-lying tundra | | |
* A category or definition that applies only in Southeast Alaska. ** In tropical climates, 10D indicates areas of dominant mangrove vegetation. |