Fetch and display watershed boundaries directly from the USGS National Map API
Controls
Due to border issues in USGS data, some watersheds may not fully display. A caveat will appear for any watershed data found to be incomplete but still displayed.
Tip: Click any watershed on the map to auto-fill this field!
Uncertain headwaters are highlighted in orange — classification may be inaccurate near USGS data gaps.
Headwater Analysis Results
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Total Watersheds
-
Headwaters
🔵 Blue on Map
-
Non-Headwaters
⚪ Gray on Map
-
Headwater %
Analysis Details
Method:-
Data Source:-
Region:-
HUC Size:-
How to Use
Supported Regions & HUC Codes:
Verified Working Regions:
• Region 01: New England
• Region 03: South Atlantic-Gulf
• Region 05: Ohio
• Region 06: Tennessee
• Region 07: Upper Mississippi
• Region 08: Lower Mississippi
• Region 09: Souris-Red-Rainy
• Region 10: Missouri
• Region 11: Arkansas-White-Red
• Region 13: Rio Grande
• Region 14: Upper Colorado
• Region 15: Lower Colorado
• Region 16: Great Basin
• Region 18: California
Partial Display (via data fallback):
• Region 02: Mid-Atlantic
• Region 04: Great Lakes
• Region 12: Texas-Gulf
• Region 17: Pacific Northwest
HUC Code Format:
• HUC10: 10-digit codes starting with region number
• HUC12: 12-digit codes starting with region number
Usage:
Fetch All: Select region and HUC size
Filter Specific: Enter a HUC code
Example Codes:
Region 06 HUC12: 060000000101
Features:
Direct API access
Interactive map
Auto boundary fitting
Real-time fetching
Validation
Data Confidence Clarity
Calculated Network Data
Restrictions & Notes:
Only HUC10/HUC12
Cannot mix regions
Depends on USGS API
Regions 02, 04, 12, 17 display via partial data fallback
HUC10 network data (upstream/downstream counts, areas, flow direction) is derived from HUC12 source data and is a secondary calculation, not a primary USGS product