About this river
Delaware River is a 4.5 mile river near Historic Bethlehem River Tours in Pennsylvania. Streamflow is measured at the USGS gauge Delaware River at Riegelsville NJ (site 01457500). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2019 to 2026
Delaware River typically runs highest in April, at a median 14,650 cfs, and lowest in September, at 4,455 cfs. The highest flow on record for any single day is 122,000 cfs, in 2021.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 10,800 | 6,490 to 18,000 | |
| February | 9,240 | 5,295 to 15,350 | |
| March | 14,300 | 12,300 to 20,000 | |
| April | 14,650 | 10,600 to 25,350 | |
| May | 12,000 | 9,480 to 24,400 | |
| June | 8,120 | 5,350 to 13,700 | |
| July | 6,570 | 4,960 to 9,990 | |
| August | 5,680 | 4,140 to 9,610 | |
| September | 4,455 | 3,500 to 9,460 | |
| October | 6,030 | 3,430 to 12,000 | |
| November | 6,850 | 4,565 to 14,350 | |
| December | 11,500 | 7,370 to 22,800 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 7 years of record. Statistics published by the US Geological Survey for Delaware River at Riegelsville NJ (site 01457500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Delaware River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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