Conemaugh River at Johnstown
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
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- Upstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 04/13/2025 4:15 PM EDTRecord: 41.6 ftLow Threshold: 0 ftCATEGORY STAGE 
Major Flooding 34 ft Moderate Flooding 30 ft Minor Flooding 28 ft Action 23 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
Stage may be affected by ice.
National Water Model Hydrograph
Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for river gauge locations using hydrologic models which are calibrated to that location. This process considers additional guidance and information, including local expertise and experience, to produce the best forecast possible. The NWM output provides supplemental guidance to NWS forecasters and should not be considered an official NWS river forecast.
Flood Impacts
- 41.6 - Flood of record from 1889.
- 34 - Flood waters begin to reach the Horner Street Bridge.
- 33.5 - Approximate level of the FEMA 0.2% Annual Chance Flood level (500-year flood).
Gauge Location
Recent Crests
| 1. | 25.30 ft | on 01-19-1996 |
| 2. | 34.00 ft | on 07-20-1977 |
| 3. | 39.00 ft | on 03-18-1936 |
| 4. | 30.20 ft | on 03-29-1924 |
| 5. | 41.60 ft | on 05-31-1889 |
Recent Crests
| 1. | 25.30 ft | on 01-19-1996 |
| 2. | 34.00 ft | on 07-20-1977 |
| 3. | 39.00 ft | on 03-18-1936 |
| 4. | 30.20 ft | on 03-29-1924 |
| 5. | 41.60 ft | on 05-31-1889 |
Historic Crests
| 1. | 41.60 ft | on 05-31-1889 |
| 2. | 39.00 ft | on 03-18-1936 |
| 3. | 34.00 ft | on 07-20-1977 |
| 4. | 30.20 ft | on 03-29-1924 |
| 5. | 25.30 ft | on 01-19-1996 |
Historic Crests
| 1. | 41.60 ft | on 05-31-1889 |
| 2. | 39.00 ft | on 03-18-1936 |
| 3. | 34.00 ft | on 07-20-1977 |
| 4. | 30.20 ft | on 03-29-1924 |
| 5. | 25.30 ft | on 01-19-1996 |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1164.90 ft |
| moderate Flooding | 1160.90 ft |
| minor Flooding | 1158.90 ft |
| action | 1153.90 ft |
| Latest Value | 1134.37 ft |
| Gauge Zero | 1130.90 ft |
Gauge Photos
No Images Found
Unique Local Info
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Potential River Levels Used to Estimate the Chance of Flooding and the Range of Possible River Levels |
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| 10 Day (HEFS) | 10 Day (NAEFS) | 10 Day (GEFS) |
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Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.
Click individual graphics to enlarge.
Collaborative Agencies
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.