- pa.water.usgs.gov - Real-time "streamflow" data, including current river levels (Lehigh River in Bethlehem), a table of levels from Hurricane Ivan (Sept 2004), and other historical river levels. Just not the Delaware River in Easton. If you get errors, try again in 5 min.
- Advanced Hydrogloic Prediction Service - From NWS, lists some historical river peaks.
- Bethlehem Weather - National Weather Service, flood warnings include some river data.
- Morning Call and WFMZ - local news including user-submitted pictures
As of 4am, the Lehigh River in Bethlehem is forecast to come to 23 feet, only 2 feet shy of the levee protecting south Bethlehem. "Flood stage" is defined as 16 feet. The Hurricane Ivan flood reached 19.7 feet here.