Quick answer: The Pearl River reaches flood stage at Jackson at 28 feet, where minor flooding begins; moderate flooding starts at 33 feet and major at 36 feet. Its record crest of 43.28 feet came during the 1979 Easter Flood, and on February 17, 2020, the river crested at 36.67 feet — its highest since 1983. River flooding pushes contaminated water into low-lying homes on both sides of the river, which is why it’s handled as flood cleanup, not an ordinary dry-out. If the Pearl is rising toward your home, get people and pets to dry ground early and line up help before the crest.
The Pearl River is the defining feature of flood risk across the Jackson metro. It runs along the eastern edge of the city, separating Jackson in Hinds County from Pearl and Flowood in Rankin County, and its floodplain reaches into neighborhoods on both banks. Understanding how the river behaves — the numbers that matter, the floods that set the benchmarks, and the reservoir upstream — is the difference between being caught off guard and being ready.
What the flood-stage numbers mean
The National Weather Service tracks the Pearl at Jackson through a gauge (NWS site JACM6, USGS station 02486000) and sorts rising water into four categories. Action stage is 24 feet, where the river is worth watching. Minor flooding — the official flood stage of 28 feet — is where water starts reaching low-lying roads and yards. Moderate flooding begins at 33 feet, and major flooding at 36 feet,1 where the river threatens homes and forces evacuations in the floodplain.
One important caution: older references sometimes cite a much lower flood-stage figure from before a gauge-datum change in the early 2000s. Those numbers aren’t comparable to today’s readings. When you’re checking the river, use the current National Weather Service gauge and its 28-foot flood stage1 — not a historical figure from a different measuring baseline.
The floods that set the benchmarks
Two floods anchor Jackson’s flood memory.
The first is the 1979 Easter Flood, still the river’s record. The Pearl reached a record crest of 43.28 feet on April 17, 1979,2 inundating large parts of the city and surrounding communities. It remains the high-water mark that every subsequent flood is measured against, and the event that shaped how the metro thinks about the river.
The second is the February 2020 flood. On February 17, 2020, the river crested at 36.67 feet — the highest level since 1983 and, by the U.S. Geological Survey’s count, the fourth-highest crest since records began in 1901 — some accounts, the National Weather Service’s among them, place it third.3 The 2020 flood forced evacuations, swamped low-lying neighborhoods on both sides of the river, and served as a hard reminder that a major Pearl River flood is not a once-in-a-lifetime event.
The Ross Barnett Reservoir upstream
You can’t understand the Pearl at Jackson without the reservoir above it. The Ross Barnett Reservoir, operated by the Pearl River Valley Water Supply District (PRVWSD), sits on the Pearl just upstream of the metro, straddling the Madison–Rankin county line.4 It’s a water-supply and recreation reservoir, not primarily a flood-control structure, and how it manages high water during a wet period affects river levels downstream through Jackson, Pearl, and Flowood.
That relationship is often misunderstood by homeowners, who assume the reservoir will simply hold back a flood. In practice, once the basin is saturated and inflow is high, water has to move downstream, and levels through the metro rise accordingly. The practical takeaway during a flood watch is to follow the National Weather Service river forecast rather than assume the reservoir will hold the water back.
Flooding beyond the river itself
Not all of Jackson’s flooding comes from the Pearl. The city also floods from within, through urban creeks and overwhelmed drainage. Town Creek and Hanging Moss Creek are the two that most often drive flash flooding inside Jackson, backing up during intense rain and putting water into neighborhoods that sit nowhere near the riverbank. A home well outside the Pearl’s floodplain can still flood from a creek that jumps its banks or a storm drain that can’t keep up.
The distinction matters for homeowners: river flooding is a slow, forecastable event you can often prepare for over hours or days, while flash flooding from a creek or drain can arrive in minutes with little warning. Both leave contaminated water behind, and both are handled as flood cleanup.
The long-running flood-control question
Flood control on the Pearl has been debated in Jackson for decades. The local authority is the Rankin-Hinds Pearl River Flood and Drainage Control District, which has studied ways to reduce the metro’s flood risk. The most-discussed proposal is the “One Lake” plan, which would reshape a stretch of the river to lower flood levels.
It’s important to describe One Lake accurately: it is a proposed, locally-preferred plan under review — it has not been approved, funded, or built, and it remains the subject of federal review and public debate. Anyone telling you the metro’s flood problem has been solved, or that a project is under construction, is getting ahead of the facts. For now, the river behaves as it always has, and homeowners should plan around the risk that exists today.
When the Pearl floods your home
If river water reaches your home, treat it as the health hazard it is. Floodwater from the Pearl carries mud, sewage, chemicals, and bacteria — it is Category 3, “black” water under restoration standards. That changes everything about the cleanup:
- Get out early. Move people and pets to dry ground before the water arrives, and don’t drive or walk through moving floodwater.
- Stay clear of electricity. Don’t step into standing water near outlets or the panel; cut power to affected areas at the breaker only if you can do it safely.
- Don’t try to salvage everything. Porous materials that soaked up floodwater usually can’t be safely cleaned and will need to come out.
- Document, then call. Photograph the loss before touching anything, then get a professional flood cleanup crew moving. The sooner extraction, disinfection, and drying begin, the more of your home survives.
A federal disaster declaration sometimes follows a major flood, but don’t assume it means direct help for homeowners — recent Jackson-area declarations have activated public-infrastructure assistance rather than individual grants.5 Your own flood insurance and quick action are what protect you.
Sources
- National Weather Service — Pearl River at Jackson gauge (JACM6): the current flood categories and datum.
- NWS Jackson — the 1979 Easter Flood: the 43.28-foot record crest.
- USGS — Pearl River at Jackson, station 02486000 and the February 17, 2020 flood-inundation data.
- Pearl River Valley Water Supply District (The Rez): Ross Barnett Reservoir operations.
- FEMA — Disaster DR-4538: the February 2020 Mississippi flood declaration.