Flood outlook for Maryland.
213 NOAA river gauges report in Maryland. 8 are forecast at or above action stage, and 1 is already reading at or above it.
Gauges across Maryland.
One dot per NOAA river gauge. Filled dots carry a current forecast; hollow rings report an observation only.
188 of these gauges carry no current forecast and are drawn as hollow rings: present, and explicitly not forecast. That is not a statement that flooding is not expected there — NOAA's river forecast centres issue forecasts for a subset of the network, and the rest of these gauges only report what the water is doing now.
- Minor flooding2 forecast · 0 observed
- Action stage6 forecast · 1 observed
- No flooding17 forecast · 127 observed
At or above action stage in Maryland.
Recorded September 9, 2026. Every row says whether the category is a FORECAST — the highest level still ahead — or an OBSERVATION taken at the gauge. They frequently disagree.
| Gauge | Reading | Level | Category |
|---|---|---|---|
| Chesapeake Bay At Bishops Head (In Mllw) | forecast | 3.2 ft | Minor flooding |
| Severn River At Annapolis (In Mllw) | forecast | 2.6 ft | Minor flooding |
| Chesapeake Bay Above Little Annemessex River At Crisfield Md (Mllw) | forecast | 3.2 ft | Action stage |
| Chesapeake Bay At Cambridge (In Mllw) | forecast | 3.2 ft | Action stage |
| Chesapeake Bay At Havre De Grace (In Mllw) | forecast | 3.8 ft | Action stage |
| Northwest Branch Patapsco River At Baltimore/Fort Mchenry (In Mllw) | forecast | 2.8 ft | Action stage |
| Patuxent River At Solomons Island (In Mllw) | forecast | 2.6 ft | Action stage |
| St. George Creek At Straits Point (In Mllw) | forecast | 2.5 ft | Action stage |
What these categories mean.
The two things worth understanding before drawing a conclusion from this map.
Each gauge carries two independent readings. The forecast is the highest level still ahead in the river forecast centre's current forecast — which is what makes this map forward-looking. The observed category describes the gauge's latest actual reading. A gauge can be quiet now and forecast to reach minor flooding in two days, or the reverse. A gauge with no forecast is not a gauge forecast to stay dry; it is a gauge NOAA has not issued a forecast for.
Driftwise re-serves NOAA's own categories from a copy refreshed hourly. We do not issue forecasts, we do not issue warnings, and this page can be up to an hour behind. For flood warnings in Maryland, and for anything you would act on, use theNational Water Prediction Serviceand your local National Weather Service office; for life-safety information, follow your local emergency management agency.
See Maryland on the live map.
This page is a still frame. The national map is interactive — pan, zoom, filter, and read every record behind what you see here.
NOAA’s river forecast centres call the next few days at every forecast gauge in the country, on the National Weather Service’s own flood categories — action, minor, moderate and major.
More on Maryland.
Every Driftwise public map covers Maryland. No login, no paywall.
Watershed Explorer
Click any point in the country and read what six federal datasets say about it — flow, drought, fire, flood forecast, satellite cyanobacteria screening and Clean Water Act impairment — each one labelled with what it is actually a fact about.
Wildfire & Smoke Map — Maryland
Official NIFC fire perimeters and incident points under NOAA’s HRRR-Smoke near-surface forecast, filterable by size, state, and containment.
Streamflow Map — Maryland
Every reporting USGS stream gauge in the country, coloured by how today’s flow ranks against that gauge’s own record for this calendar day.
U.S. Drought Map — Maryland
The U.S. Drought Monitor — the country’s official weekly drought assessment — drawn across five severity categories from D0 to D4.
Impaired Waters Map — Maryland
Every subwatershed in the country against the states’ own Clean Water Act assessments — what is impaired, what is still on the 303(d) list, what is causing it, and how much of the country nobody has assessed at all.
Cyanobacteria Bloom Map — Maryland
NASA and EPA’s satellites read a pigment index over roughly 2,300 U.S. lakes large enough to resolve at 300 m. A pre-screening indicator, not a health assessment, and never a substitute for your state’s advisory.
Critical Habitat & Protected Waters Map — Maryland
Every river and stream the federal government has designated as ESA critical habitat, the listed species each unit is designated for, and who manages the protected land around it.
Flood outlook by state.
Every state, with the number of NOAA gauges at or above action stage there. The national map covers all of them at once.
- Alabama1 at or above action
- Alaska8 at or above action
- Arizona136 gauges
- Arkansas98 gauges
- California1 at or above action
- Colorado279 gauges
- Connecticut55 gauges
- Delaware2 at or above action
- District of Columbia1 at or above action
- Florida9 at or above action
- Georgia2 at or above action
- Hawaii75 gauges
- Idaho224 gauges
- Illinois251 gauges
- Indiana283 gauges
- Iowa7 at or above action
- Kansas223 gauges
- Kentucky193 gauges
- Louisiana1 at or above action
- Maine1 at or above action
- Maryland8 at or above action
- Massachusetts4 at or above action
- Michigan204 gauges
- Minnesota381 gauges
- Mississippi163 gauges
- Missouri214 gauges
- Montana277 gauges
- Nebraska263 gauges
- Nevada104 gauges
- New Hampshire2 at or above action
- New Jersey2 at or above action
- New Mexico112 gauges
- New York347 gauges
- North Carolina2 at or above action
- North Dakota3 at or above action
- Ohio307 gauges
- Oklahoma213 gauges
- Oregon299 gauges
- Pennsylvania1 at or above action
- Puerto Rico117 gauges
- Rhode Island2 at or above action
- South Carolina2 at or above action
- South Dakota1 at or above action
- Tennessee216 gauges
- Texas2 at or above action
- Utah95 gauges
- Vermont58 gauges
- Virginia6 at or above action
- Washington285 gauges
- West Virginia190 gauges
- Wisconsin237 gauges
- Wyoming215 gauges
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