Long Green Creek at Glen Arm, MD
USGS Site No: 01584050 • Long Green Creek • Baltimore County, MD
Long Green Creek at Glen Arm, MD on the Long Green Creek is currently at 5 cfs (Low — 19th percentile for this date) . Gage height: 1.08 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 4 | |
| 25th | Low threshold | 6 | Today: 5 cfs |
| 50th (Median) | Normal (median) | 8 | |
| 75th | High threshold | 11 | |
| 95th | Very High threshold | 35 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 6 | — |
| May 27, 2026 | 8 | — |
| May 26, 2026 | 8 | — |
| May 25, 2026 | 10 | — |
| May 24, 2026 | 37 | — |
| May 23, 2026 | 16 | — |
| May 22, 2026 | 5 | — |
| May 21, 2026 | 5 | — |
| May 20, 2026 | 4 | — |
| May 19, 2026 | 4 | — |
| May 18, 2026 | 4 | — |
| May 17, 2026 | 4 | — |
| May 16, 2026 | 4 | — |
| May 15, 2026 | 4 | — |
| Apr 21, 2026 | 5 | — |
| Apr 20, 2026 | 5 | — |
| Apr 19, 2026 | 5 | — |
| Apr 18, 2026 | 5 | — |
| Apr 17, 2026 | 5 | — |
| Apr 16, 2026 | 5 | — |
| Apr 15, 2026 | 6 | — |
| Apr 14, 2026 | 5 | — |
| Apr 13, 2026 | 5 | — |
| Apr 12, 2026 | 5 | — |
| Apr 11, 2026 | 5 | — |
| Apr 10, 2026 | 6 | — |
| Apr 9, 2026 | 6 | — |
| Apr 8, 2026 | 6 | — |
| Apr 7, 2026 | 6 | — |
| Apr 6, 2026 | 7 | — |
Station Information
- USGS Site No
- 01584050
- State
- MD
- County
- Baltimore County
- Coordinates
- 39.4547, -76.4789
- Drainage Area
- 9 mi²
- Datum (ft)
- 240.4
- HUC Code
- 020600030502
Flood Stage Thresholds
- Action Stage
- 4.0 ft
- Flood Stage
- 7.0 ft
- Moderate Flood
- 10.0 ft
- Major Flood
- 15.0 ft
Currently 5.92 ft below flood stage.
Recent Extremes
- Max discharge
-
69 cfsJul 31, 2025
- Min discharge
-
3 cfsSep 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Little Gunpowder Falls at Laurel Brook, MDLow4.3 mi · 24 cfs
-
Minebank Run Near Glen Arm, MDNormal5.2 mi · 1 cfs
-
Whitemarsh Run Near Fullerton, MDNormal5.3 mi · 1 cfs
-
Whitemarsh Run at White Marsh, MDNormal6.1 mi · 2 cfs
-
Long Quarter Branch at Lutherville, MDNormal6.6 mi · 1 cfs