Flood Alert Issued for Mansbridge and Riverside Park in Southampton

Alert Details

The Environment Agency has issued a flood alert for the Solent and South Downs region, specifically targeting the River Itchen at Mansbridge and Riverside Park. The alert was raised on February 20, 2026, in response to high river levels and forecasted tidal activity.

Affected Areas

The geographic scope of this alert includes Mansbridge and Riverside Park within the county of Hampshire and the city of Southampton. Specific locations at risk include the access road and car parking areas near the White Swan Pub, the car garage at Mansbridge, and parts of Riverside Park. Water levels are also expected to be very high at Gaters Mill.

What You Should Do

Residents and business owners in the affected areas should consider activating any available flood protection products. This includes deploying defenses around the White Swan pub. The Environment Agency is currently monitoring rainfall and river levels and is coordinating with Southampton City Council regarding the operation of Woodmill.

Expected Conditions

Flooding is possible due to a combination of high tides and elevated river flow. On February 21, 2026, the early morning high tides (01:00 and 03:00) are expected to reach 4.74 metres Chart Datum (2.00mAOD). The afternoon high tides (13:15 and 15:15) are forecast to be higher, reaching 4.86 metres Chart Datum (2.12mAOD). While only a small amount of rain is forecast for the next five days, the flood risk will remain high until the River Itchen’s flow decreases.

Timeline

The alert is effective immediately, with the primary threat occurring during the high tide cycles on February 21, 2026. High river levels are expected to persist over the next three days. The Environment Agency plans to provide an update on the situation by 19:00 on February 21, 2026.