Delaware River at Delaware City (IN MLLW)
Future / Actual / Minor
OWP 2.0 WWA Modal Title
01/11/2021, 10:04 PM UTC through 01/11/2021, 10:04 PM UTC
Sender
Sent
- Warning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.No secondary data available. Transformations for Flow data and a secondary Y axis cannot be made at this time.
Traces and Thresholds Click to turn on/off display
Observed (OBS) 06/10/2025 12:36 AM EDTRecord: 9.7 ftLow Threshold: -2 ftCATEGORY STAGE 
Major Flooding 9.5 ft Moderate Flooding 8.5 ft Minor Flooding 7.5 ft Reliability of the Forecast:
NOTE: Forecasts are not available. Only observed stages are available for this point.
Please refer to our Coastal Hazard Message for specific information regarding Coastal Flood Watches, Warnings and Advisories. During tropical cyclones, please refer here for additional storm surge information.
Flood impacts are based on long-term averages. Actual impacts from any tidal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow.
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
- 9.73 - (Mean Lower Low Water (MLLW)) The level reached on October 30, 2012 during Post Tropical Cyclone Sandy.
- 9.54 - (MLLW) The level reached on October 29, 2021.
- 9.5 - (MLLW) MAJOR FLOODING. At this level, widespread roadway flooding begins near the bay, the river and the tidal tributaries in New Castle County DE and Salem County NJ. Vulnerable homes and businesses may be damaged as water levels rise further above this threshold. Numerous roads become impassable and some neighborhoods may be isolated. The flood waters become a danger to anyone who attempts to cross on foot or in a vehicle.
Gauge Info
| Coordinates | 39.5817, -75.5883 |
| RFC | MARFC |
| State | DE |
| WFO | PHI |
| County | New Castle |
| Data Provider(s) | |
| National Ocean Service | National Ocean and Coastal Agency |
Gauge Location
Recent Crests
| 1. | 8.59 ft | on 04-12-2024 |
| 2. | 9.06 ft | on 01-10-2024 |
| 3. | 9.54 ft | on 10-29-2021 |
| 4. | 9.09 ft | on 09-10-2018 |
| 5. | 8.72 ft | on 01-23-2016 |
Recent Crests
| 1. | 8.59 ft | on 04-12-2024 |
| 2. | 9.06 ft | on 01-10-2024 |
| 3. | 9.54 ft | on 10-29-2021 |
| 4. | 9.09 ft | on 09-10-2018 |
| 5. | 8.72 ft | on 01-23-2016 |
| 6. | 8.46 ft | on 05-01-2014 |
| 7. | 9.47 ft | on 12-21-2012 |
| 8. | 9.73 ft | on 10-30-2012 |
| 9. | 8.83 ft | on 08-27-2011 |
| 10. | 9.38 ft | on 04-16-2011 |
| 11. | 9.13 ft | on 05-12-2008 |
| 12. | 8.71 ft | on 09-19-2003 |
Historic Crests
| 1. | 9.73 ft | on 10-30-2012 |
| 2. | 9.54 ft | on 10-29-2021 |
| 3. | 9.47 ft | on 12-21-2012 |
| 4. | 9.38 ft | on 04-16-2011 |
| 5. | 9.13 ft | on 05-12-2008 |
Historic Crests
| 1. | 9.73 ft | on 10-30-2012 |
| 2. | 9.54 ft | on 10-29-2021 |
| 3. | 9.47 ft | on 12-21-2012 |
| 4. | 9.38 ft | on 04-16-2011 |
| 5. | 9.13 ft | on 05-12-2008 |
| 6. | 9.09 ft | on 09-10-2018 |
| 7. | 9.06 ft | on 01-10-2024 |
| 8. | 8.83 ft | on 08-27-2011 |
| 9. | 8.72 ft | on 01-23-2016 |
| 10. | 8.71 ft | on 09-19-2003 |
| 11. | 8.59 ft | on 04-12-2024 |
| 12. | 8.46 ft | on 05-01-2014 |
Vertical Datum Table
| type | MLLW* | NAVD88 |
|---|---|---|
| major Flooding | 9.50 ft | 6.59 ft |
| moderate Flooding | 8.50 ft | 5.59 ft |
| minor Flooding | 7.50 ft | 4.59 ft |
| action | N/A | N/A |
| Latest Value | 6.64 ft | 3.73 ft |
| Gauge Zero | 0.00 ft | -2.91 ft |
Gauge Photos
No Images Found
Probability Information
No Images Available
Unique Local Info
All gage data is referenced in MLLW. During winter months, cold and ice may result in inaccurate real-time stages. Adjustments or deletions of this data can only be done after detailed analysis.
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.