Susquehanna River at Marietta, PA
USGS gauge 01576000 · drainage 25,990 sq mi · observed Oct 16, 9:15 PM EDT · 65 min old
Last 7 days Live gauge
Source: USGS Water Data API (continuous values), observed to Oct 16, 9:15 PM EDT. Shaded band: 25th to 75th percentile of USGS daily statistics for each date; dashed: median. Flow in cfs.
Rate of rise and fall Live gauge
| Window | Flow then | Change to latest | Gage height then | Gage height change |
|---|---|---|---|---|
| 1 h | 21,600 cfs | ▬ +0.00 cfs (+0.0%) | 35.55 ft | +0.01 ft |
| 3 h | 21,600 cfs | ▬ +0.00 cfs (+0.0%) | 35.56 ft | +0.00 ft |
| 6 h | 21,700 cfs | ▬ -100 cfs (-0.5%) | 35.57 ft | -0.01 ft |
| 12 h | 22,600 cfs | ▼ -1,000 cfs (-4.4%) | 35.68 ft | -0.12 ft |
| 24 h | 25,600 cfs | ▼ -4,000 cfs (-15.6%) | 36.03 ft | -0.47 ft |
Last 7 days
| Measure | Flow | Time | Relative to latest reading |
|---|---|---|---|
| Highest reading | 38,600 cfs | Oct 13, 4:30 PM EDT | 77 h earlier |
| Lowest reading | 8,800 cfs | Oct 11, 1:00 PM EDT | 128 h earlier |
Source: computed from USGS continuous readings (Water Data API) to Oct 16, 9:15 PM EDT. Each row compares the latest reading with the reading closest to that many hours earlier; the arrow is steady (▬) when the change is within 1%.
Daily mean flow Live gauge
| Date (gauge-local) | Mean flow | Note |
|---|---|---|
| Oct 16, 2026 | 22,721 cfs | |
| Oct 15, 2026 | 25,029 cfs | |
| Oct 14, 2026 | 29,733 cfs | |
| Oct 13, 2026 | 36,342 cfs | |
| Oct 12, 2026 | 28,580 cfs | |
| Oct 11, 2026 | 11,533 cfs | |
| Oct 10, 2026 | 9,301 cfs | |
| Oct 9, 2026 | 10,200 cfs | |
| Oct 8, 2026 | – | Partial day |
Source: USGS Water Data API (continuous values); each mean uses readings on that gauge-local date, shown only with at least 80% of expected readings.
The same 50 days in earlier years Historical record
━ 2026 ╌ 2025 ╌ 2024 ╌ 2023
| Year | Mean flow | Highest day |
|---|---|---|
| 2026 | 23,008 cfs | 57,200 cfs |
| 2025 | 5,766 cfs | 8,820 cfs |
| 2024 | 11,423 cfs | 23,600 cfs |
| 2023 | 22,944 cfs | 39,600 cfs |
Source: USGS daily mean flows (Water Data API). Each line is the 50 days from Aug 27 to Oct 15, shifted to the same calendar dates in earlier years; gaps are days without a published value. Recent days are provisional.
Compared with this gauge’s record Historical record
| Measure | Value | When or rank |
|---|---|---|
| Peak daily flow, last 7 days | 36,200 cfs | Oct 13, 2026 |
| Last time daily flow was this high or higher | 37,800 cfs | Sep 8, 2026 (35 days earlier) |
| Last day above the 90th percentile for its date, before this peak | Sep 9, 2026 | 34 days earlier |
| Days above the 75th percentile for their date | 19 of 30 | last 30 days |
| October 1 to 15, mean flow | 17,286 cfs | rank 30 highest of 96 years |
| Peak daily mean compared with annual instantaneous peaks of record | Below the lowest of 94 | lowest annual peak 129,000 cfs |
Source: USGS daily mean flows (Water Data API), 1931 to 2026 (34,714 days), data through Oct 15, 2026, computed 2026-10-17; method record-v1. Percentiles are USGS daily statistics. Recent days are provisional.
Largest annual peaks Historical record
Ten largest peaks of record
| Date | Peak flow | Gage height at peak |
|---|---|---|
| Jun 23, 1972 | 1,080,000 cfs | 64.54 ft |
| Mar 19, 1936 | 787,000 cfs | 60.73 ft |
| Sep 9, 2011 | 665,000 cfs | 58.16 ft |
| Jun 2, 1889 | 630,000 cfs | 58.30 ft |
| Jan 21, 1996 | 601,000 cfs | 56.80 ft |
| Sep 20, 2004 | 577,000 cfs | 56.28 ft |
| Sep 27, 1975 | 545,000 cfs | 55.73 ft |
| May 29, 1946 | 492,000 cfs | 54.90 ft |
| Mar 12, 1964 | 473,000 cfs | 54.03 ft |
| Feb 16, 1984 | 458,000 cfs | 53.49 ft |
Five most recent annual peaks
| Date | Peak flow | Gage height at peak |
|---|---|---|
| Apr 5, 2024 | 293,000 cfs | 48.86 ft |
| May 2, 2023 | 174,000 cfs | 44.70 ft |
| Feb 20, 2022 | 189,000 cfs | 45.29 ft |
| Dec 27, 2020 | 317,000 cfs | 49.60 ft |
| May 2, 2020 | 254,000 cfs | 47.60 ft |
Source: USGS annual peak streamflow (Water Data API), 94 annual peaks, 1889 to 2024. A water year's peak is its highest instantaneous flow.
Historic crests Official NWS
| Date | Crest stage | Flow |
|---|---|---|
| Jun 22, 1972 | 64.54 ft | 1,080,000 cfs |
| Mar 18, 1936 | 60.73 ft | 787,000 cfs |
| Jun 1, 1889 | 58.30 ft | 630,000 cfs |
| Sep 9, 2011 | 58.16 ft | 665,000 cfs |
| Jan 20, 1996 | 56.80 ft | 600,500 cfs |
| Sep 19, 2004 | 56.27 ft | 577,000 cfs |
| Sep 26, 1975 | 55.73 ft | – |
| May 28, 1946 | 54.90 ft | – |
| Mar 11, 1964 | 54.03 ft | – |
| Feb 15, 1984 | 53.49 ft | – |
Source: National Weather Service forecast point MRTP1 (Susquehanna River at Marietta), historic crests as published by the NWS; the NWS may have recorded them on an older gauge datum. The USGS annual peaks above are a separate record and can differ in date, flow and datum.
Gage height to flow rating Historical record
Line: current USGS rating, gage height (ft, horizontal) to flow (cfs, vertical). ● latest reading, 35.56 ft and 21,600 cfs.
Source: USGS rating table for the gauge (NWIS rating depot, expanded shifted rating, 3,875 rows, thinned to 92 points), fetched Oct 16, 10:12 PM EDT. Ratings are provisional and change with the channel.
Water temperature by month Historical record
Source: USGS daily mean water temperature (parameter 00010, Water Data API), 2015 to 2017, mean of all published daily values in each calendar month (days counted under each month; (few) means fewer than 150 daily values).
Flood stages Official NWS
| Category | Gage height (ft) |
|---|---|
| Action | 44.0 ft |
| Minor | 49.0 ft |
| Moderate | 52.0 ft |
| Major | 54.0 ft |
Source: National Weather Service forecast point MRTP1 (Susquehanna River at Marietta), fetched Oct 16, 10:16 PM EDT. Compare with the gage height above; thresholds belong to that forecast point.
Flood impacts by stage Official NWS
| Stage | National Weather Service impact statement |
|---|---|
| 44.0 ft | The right, or west bank overflows. Some roadways are affected. |
| 47.0 ft | Low lying undeveloped areas on both banks are inundated. A couple of roadways are closed. |
| 49.0 ft | Front Street in Wrightsville floods. Low lying areas of route 624 on the right, or west bank and along route 441 on the left, or east bank are also affected. Riverside recreation area is also inundated. |
| 52.0 ft | A number of residences in the Wrightsville and Columbia areas begin to be affected. |
| 54.0 ft | Numerous homes and businesses in the Columbia and Wrightsville areas are affected by high water. The Wilton Company in Wrightsville experiences problems with high water. |
| 56.0 ft | Widespread flooding occurs on both sides of the river. Many homes and businesses are affected. |
| 59.0 ft | Widespread flooding occurs on both sides of the river. Many homes and businesses are affected by high water. The Wrightsville water supply is affected by flood waters. |
| 64.0 ft | Widespread flooding on both banks affects homes, businesses, and the water and sewage plants. |
Source: National Weather Service forecast point MRTP1 (Susquehanna River at Marietta). Statements are quoted from the NWS and describe that forecast point.
Sources and method
- Data: U.S. Geological Survey. Terms
- River forecasts and flood stages: National Weather Service. National Water Model guidance: NOAA. Terms
USGS daily statistics, downloaded 2026-10-12
Percentile method: trailing 24 h mean vs USGS daily percentiles for calendar date 10-16.
Percentile is estimated from USGS published daily percentiles. Readings are provisional until USGS reviews them. Not endorsed by USGS, NOAA or the National Weather Service. Not for navigation or safety-of-life decisions; the absence of an alert is not a statement that conditions are safe.