Maryland · Howard / Baltimore Co.
Patapsco River
🏔 Scenic River
Howard / Baltimore Co. · 39 mi · Class I–II
Optimal: 150–800 CFS · USGS #01589000
73.1CFS
1.61 ft gauge height
Below Optimal→Stable
Avg flow: 320 cfsHist. median: 290 cfsUSGS #01589000
Patapsco Valley State Park · Maryland Scenic River
The Patapsco flows 39 miles from the Piedmont through the heart of Patapsco Valley State Park before reaching Baltimore Harbor. The state park protects over 30 miles of river corridor with historic mill towns, stone arch railroad bridges, and Class I–II paddling through hemlock-lined gorges. The 2018 Bloede Dam removal — the largest dam removal in Maryland history — restored migratory fish runs to the lower river for the first time in over a century.
Outfitters
Patapsco Valley State Park
River access points and primitive camping in the Patapsco Valley
10-Year Flow Patterns
See 10 years of flow patterns for this river — historical analysis is a Pro feature.Upgrade to Pro →
Your Optimal Range
Set your personal optimal CFS window per river — custom ranges are a Pro feature.Upgrade to Pro →
Data Quality
River conditions are community-verified. CFS ranges, difficulty ratings, and access points may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level.
Know the Patapsco River? Your local knowledge makes this page better for every paddler, angler, and guide who comes after you.
Improve This River →