Ammonoosuc River at Bethlehem
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
- Upstream gauge unavailableDownstream gauge unavailableWarning: no valid ratings curve available. Transformations to and from FEET/CFS/KCFS will not happen.
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Observed (OBS) 04/03/2025 5:30 AM EDTRecord: 12.3 ftCATEGORY STAGE 
Major Flooding 14 ft Moderate Flooding 12 ft Minor Flooding 8 ft Action 6 ft Reliability of the Forecast:
NOTE: Forecasts are issued as needed during times of high water, but are not routinely available.
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
- 12 - Flood comparable to December 2023. Significant flooding of a shopping area in Littleton off Meadow Road south of I-93 exit. Water to the bottom of the Pierce Bridge in Bethlehem and property off Route 302. Flooding also occurs along portions Route 116 or Whitefield Road. Portions of Feather Lane, Wing Road, Hazen Road, and Prospect Street are flooded.
- 10 - Water up to Wing Road south of Hazen Road. End portion of Garneau Road inundated.
- 9 - River Road inaccessible from Beech Hill Road to Moose Trail Road, cutting off properties.
Gauge Info
| Coordinates | 44.2687, -71.6304 |
| RFC | NERFC |
| State | NH |
| WFO | GYX |
| County | Grafton |
| Data Provider(s) | |
| US Geological Survey | USGS--Water Resources of the United States |
| USGS | 01137500 |
Gauge Location
Recent Crests
| 1. | 8.63 ft | on 04-12-2024 | (P) |
| 2. | 12.15 ft | on 12-18-2023 | |
| 3. | 9.24 ft | on 12-24-2022 | |
| 4. | 9.75 ft | on 04-15-2014 | |
| 5. | 10.90 ft | on 08-28-2011 |
Recent Crests
| 1. | 8.63 ft | on 04-12-2024 | (P) |
| 2. | 12.15 ft | on 12-18-2023 | |
| 3. | 9.24 ft | on 12-24-2022 | |
| 4. | 9.75 ft | on 04-15-2014 | |
| 5. | 10.90 ft | on 08-28-2011 | |
| 6. | 9.91 ft | on 04-24-2005 | |
| 7. | 9.22 ft | on 04-14-2002 | |
| 8. | 10.09 ft | on 12-18-2000 | |
| 9. | 9.26 ft | on 04-09-2000 | |
| 10. | 12.34 ft | on 11-12-1995 | |
| 11. | 9.84 ft | on 04-29-1988 | |
| 12. | 10.14 ft | on 04-01-1987 | |
| 13. | 10.14 ft | on 01-27-1986 | |
| 14. | 9.00 ft | on 02-12-1981 | |
| 15. | 10.69 ft | on 12-21-1973 | |
| 16. | 11.96 ft | on 06-30-1973 | |
| 17. | 9.09 ft | on 04-25-1968 | |
| 18. | 12.09 ft | on 10-24-1959 | |
| 19. | 8.98 ft | on 12-21-1957 | |
| 20. | 10.62 ft | on 09-11-1954 | |
| 21. | 11.22 ft | on 03-27-1953 | |
| 22. | 10.86 ft | on 11-26-1950 |
Historic Crests
| 1. | 12.34 ft | on 11-12-1995 |
| 2. | 12.15 ft | on 12-18-2023 |
| 3. | 12.09 ft | on 10-24-1959 |
| 4. | 11.96 ft | on 06-30-1973 |
| 5. | 11.22 ft | on 03-27-1953 |
Historic Crests
| 1. | 12.34 ft | on 11-12-1995 | |
| 2. | 12.15 ft | on 12-18-2023 | |
| 3. | 12.09 ft | on 10-24-1959 | |
| 4. | 11.96 ft | on 06-30-1973 | |
| 5. | 11.22 ft | on 03-27-1953 | |
| 6. | 10.90 ft | on 08-28-2011 | |
| 7. | 10.86 ft | on 11-26-1950 | |
| 8. | 10.69 ft | on 12-21-1973 | |
| 9. | 10.62 ft | on 09-11-1954 | |
| 10. | 10.14 ft | on 04-01-1987 | |
| 11. | 10.14 ft | on 01-27-1986 | |
| 12. | 10.09 ft | on 12-18-2000 | |
| 13. | 9.91 ft | on 04-24-2005 | |
| 14. | 9.84 ft | on 04-29-1988 | |
| 15. | 9.75 ft | on 04-15-2014 | |
| 16. | 9.26 ft | on 04-09-2000 | |
| 17. | 9.24 ft | on 12-24-2022 | |
| 18. | 9.22 ft | on 04-14-2002 | |
| 19. | 9.09 ft | on 04-25-1968 | |
| 20. | 9.00 ft | on 02-12-1981 | |
| 21. | 8.98 ft | on 12-21-1957 | |
| 22. | 8.63 ft | on 04-12-2024 | (P) |
Vertical Datum Table
| type | NAVD88 |
|---|---|
| major Flooding | 1194.48 ft |
| moderate Flooding | 1192.48 ft |
| minor Flooding | 1188.48 ft |
| action | 1186.48 ft |
| Latest Value | 1183.16 ft |
| Gauge Zero | 1180.48 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) | 7 Day (NAEFS) | 7 Day (GEFS) |
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Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.
See the Product Description Document link for more details on the interpretation of the 3,7 day graphics.
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.