Conemaugh River at Johnstown

1. 41.60 ftFlood of record from 1889.
2. 34.00 ftFlood waters begin to reach the Horner Street Bridge.
3. 33.50 ftApproximate level of the FEMA 0.2% Annual Chance Flood level (500-year flood).
4. 28.00 ftUnprotected areas in the vicinity of the river will flood.
5. 26.00 ftHigh water levels should be monitored for contunued rises.
6. 23.50 ftApproximate level of the FEMA 1% Annual Chance Flood level (100-year flood).
7. 22.50 ftFlood waters begin to reach the Coopersdale, or Laurel Avenue Bridge.
8. 20.50 ftFlood waters begin to reach the Fourth Avenue Bridge and the Bethlehem Steel footbridge.
9. 19.00 ftApproximate level of the FEMA 2% Annual Chance Flood level (50-year flood).
10. 10.50 ftApproximate level of the FEMA 10% Annual Chance Flood level (100-year flood).

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 15, 2026.

Most recent crests

• January 19, 1996: 25.30 ft
• July 20, 1977: 34.00 ft
• March 18, 1936: 39.00 ft
• March 29, 1924: 30.20 ft
• May 31, 1889: 41.60 ft

• DownstreamConemaugh River at Seward
• Little Conemaugh River at East Conemaugh
• Stonycreek River at Ferndale
• Blacklick Creek at Josephine
• Two Lick Creek at Graceton
• Yellow Creek at Homer City
• Loyalhanna Creek at Kingston
• Loyalhanna Creek at Latrobe

Forecasts by the Ohio River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. Stage may be affected by ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.