| Bishops Stortford, Grange PaddocksRiver gauge, River Stort | −0.26 m | Lowest on record | ±0 | 35 min ago |
| BuntingfordRiver gauge, River Rib | 0.05 m | Lowest on record | ±0 | 35 min ago |
| Cheshunt, Trinity LaneRiver gauge, Theobalds Brook | 0.26 m | Lowest on record | −0.09 m | 35 min ago |
| Furneux PelhamRiver gauge, River Ash | 0.07 m | Lowest on record | −0.01 m | 35 min ago |
| Gadebridge ParkRiver gauge, River Gade | 0.09 m | Lowest on record | ±0 | 35 min ago |
| Cheshunt, Rosedale WayRiver gauge, Rags Brook | 0.77 m | Very low | −0.01 m | 35 min ago |
| Hemel Hempstead, Two Waters RoadRiver gauge, River Bulbourne | 0.20 m | Very low | −0.02 m | 35 min ago |
| MarkyateRiver gauge, River Ver | −0.04 m | Very low | ±0 | 6 hours ago |
| North MymmsRiver gauge, Mimmshall Brook | 0.37 m | Very high | −0.03 m | 35 min ago |
| SawbridgeworthRiver gauge, River Stort | 1.09 m | Very low | ±0 | 35 min ago |
| Croxley GreenRiver gauge, River Gade | 0.08 m | Low | ±0 | 35 min ago |
| Dane EndRiver gauge, River Beane | 0.87 m | High | ±0 | 35 min ago |
| Hemel Hempstead, Old Fishery LaneRiver gauge, River Bulbourne | 0.66 m | Low | +0.05 m | 35 min ago |
| RedbournRiver gauge, River Red | −0.30 m | Low | ±0 | 35 min ago |
| WaterhallRiver gauge, River Lee | 0.13 m | Low | ±0 | 50 min ago |
| BorehamwoodRiver gauge, Borehamwood Brook | 0.90 m | Normal | −0.01 m | 35 min ago |
| Bragbury ParkRiver gauge, Stevenage Brook | 0.05 m | Normal | −0.01 m | 35 min ago |
| BraughingRiver gauge, River Quin | 0.09 m | Normal | ±0 | 35 min ago |
| Cheshunt, Windmill LaneRiver gauge, Small River Lee | 0.43 m | Normal | −0.08 m | 35 min ago |
| Colney StreetRiver gauge, River Ver | 0.14 m | Normal | −0.01 m | 35 min ago |
| Fulling MillRiver gauge, River Mimram | 0.06 m | Normal | ±0 | 35 min ago |
| Harlow MillRiver gauge, River Stort | 0.92 m | Normal | −0.01 m | 35 min ago |
| Harlow, Elizabeth WayRiver gauge, Canons Brook | 0.05 m | Normal | −0.01 m | 35 min ago |
| HarpendenRiver gauge, River Lee | 0.80 m | Normal | ±0 | 35 min ago |
| Hertford, Hartham ParkRiver gauge, River Beane | 0.17 m | Normal | −0.02 m | 35 min ago |
| Hoddesdon, Rye BridgeRiver gauge, River Lee | 2.84 m | Normal | ±0 | 35 min ago |
| Little HadhamRiver gauge, River Ash | 0.02 m | Normal | ±0 | 35 min ago |
| London ColneyRiver gauge, River Colne | 1.09 m | Normal | ±0 | 35 min ago |
| MardockRiver gauge, River Ash | 0.10 m | Normal | ±0 | 35 min ago |
| Mimmshall BrookRiver gauge | 0.25 m | Normal | −0.05 m | 35 min ago |
| Moor LaneRiver gauge, River Colne | 7.46 m | Normal | +0.01 m | 29 hours ago |
| PanshangerRiver gauge, River Mimram | 0.41 m | Normal | ±0 | 35 min ago |
| Pishiobury BrookRiver gauge | 0.94 m | Normal | −0.01 m | 35 min ago |
| RadlettRiver gauge, Radlett Brook | 0.37 m | Normal | −0.01 m | 35 min ago |
| RedbournRiver gauge, River Ver | 0.03 m | Normal | ±0 | 35 min ago |
| RickmansworthRiver gauge, River Chess | 0.08 m | Normal | ±0 | 35 min ago |
| Roydon, Glen FabaRiver gauge, River Stort | 1.43 m | Normal | ±0 | 35 min ago |
| Tumbling Bay WeirRiver gauge, Amwell Loop | 30.40 m | Normal | −0.01 m | 35 min ago |
| WadesmillRiver gauge, River Rib | 0.19 m | Normal | ±0 | 35 min ago |
| WalkernRiver gauge, River Beane | 0.09 m | Normal | −0.01 m | 35 min ago |
| WatfordRiver gauge, River Colne | 0.18 m | Normal | −0.01 m | 35 min ago |
| WhitwellRiver gauge, River Mimram | 0.05 m | Normal | ±0 | 35 min ago |
| David Stoker Radial GatesRiver gauge | 0.06 m | No reference yet | ±0 | 35 min ago |
| Feildes WeirRiver gauge | 27.78 m | No reference yet | ±0 | 35 min ago |
| Kiora Radial GatesRiver gauge | 22.69 m | No reference yet | ±0 | 35 min ago |
| Markyate FSARiver gauge | 5.13 m | No reference yet | ±0 | 35 min ago |
| Meadgate SluicesRiver gauge | 0.02 m | No reference yet | −0.01 m | 35 min ago |
| Rammey Marsh SluicesRiver gauge | 17.75 m | No reference yet | +0.06 m | 35 min ago |
| Richard White Radial GatesRiver gauge | 0.09 m | No reference yet | +0.01 m | 35 min ago |
| River Lee at Feildes Weir (Gauged)River gauge | 0.10 m | No reference yet | ±0 | 35 min ago |
| Rye Meads Effluent at Rye MeadsRiver gauge | 0.31 m | No reference yet | ±0 | 35 min ago |