Old Swamp River at Weymouth

Highest listed crest 5.92 ftFlood stage 4.5 ft39 crests since 1969

The Old Swamp River at Weymouth crested above flood stage 24 times among the 39 crests the National Weather Service lists from 1969 to 2024. The highest, 5.92 ft on October 15, 2005, was minor flooding, 1.42 feet above flood stage.

The gauge

Highest listed crest: 5.92 ft; October 15, 2005
Flood stage: 4.5 ft; Major flooding from 7.0 ft
Crests at major: 0; 24 above flood stage
Most recent flood crest: March 24, 2024; 4.77 ft, minor flooding
Location: Norfolk County; Near Weymouth Town (1.2 mi), Braintree Town (3.1 mi), Randolph Town (5.6 mi)
Identifiers: NWS WTHM3; USGS 01105600

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Old Swamp River at Weymouth

Action stage	4.0	15	Apr 12, 2003	The level at which the NWS or its partners begin to take action
Flood stage (minor)	4.5	24	Mar 24, 2024	Minimal or no property damage, but possibly some public threat
Moderate flood stage	6.0	0	—	Some inundation of structures and roads near the stream
Major flood stage	7.0	0	—	Extensive inundation of structures and roads

Every listed crest

39 crests from 1969 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Crests at or above flood stage, by decade

These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Old Swamp River at Weymouth

1	Oct 15, 2005	5.92	+1.42	Minor	—
2	Aug 14, 2005	5.71	+1.21	Minor	—
3	Mar 15, 2010	5.70	+1.20	Minor	401
4	Mar 30, 2010	5.46	+0.96	Minor	341
5	Feb 15, 1971	5.35	+0.85	Minor	590
6	Jun 8, 2006	5.35	+0.85	Minor	—
7	Oct 21, 1996	5.30	+0.80	Minor	303
8	Mar 22, 2001	5.24	+0.74	Minor	290
9	Aug 13, 1994	5.22	+0.72	Minor	335
10	May 14, 2006	5.14	+0.64	Minor	270
11	May 31, 1984	5.02	+0.52	Minor	286
12	Dec 13, 1992	5.01	+0.51	Minor	280
13	Feb 13, 2008	4.93	+0.43	Minor	227
14	Jan 10, 2024	4.81	+0.31	Minor	208
15	Apr 16, 2007	4.77	+0.27	Minor	199
16	Mar 24, 2024	4.77	+0.27	Minor	201
17	Mar 3, 2018	4.75	+0.25	Minor	194
18	Jan 13, 2018	4.71	+0.21	Minor	188
19	Jan 24, 2019	4.60	+0.10	Minor	170
20	Nov 24, 2006	4.59	+0.09	Minor	167
21	Mar 9, 2008	4.59	+0.09	Minor	167
22	May 26, 2005	4.58	+0.08	Minor	—
23	Sep 2, 2021	4.51	+0.01	Minor	159
24	Oct 26, 2005	4.50	0.00	Minor	—
25	Jun 7, 1982	4.44	−0.06	Action	468
26	Dec 24, 1994	4.44	−0.06	Action	178
27	Nov 1, 1991	4.41	−0.09	Action	157
28	Dec 17, 1973	4.40	−0.10	Action	300
29	Apr 22, 2000	4.37	−0.13	Action	133
30	Mar 2, 1983	4.36	−0.14	Action	323
31	Apr 21, 1991	4.36	−0.14	Action	127
32	Apr 12, 2003	4.33	−0.17	Action	127
33	Mar 25, 1969	4.32	−0.18	Action	305
34	Apr 5, 1987	4.32	−0.18	Action	150
35	Jan 25, 1979	4.22	−0.28	Action	175
36	May 12, 1989	4.06	−0.44	Action	75
37	Mar 27, 1988	4.05	−0.45	Action	118
38	Feb 26, 1981	4.01	−0.49	Action	144
39	Apr 4, 1990	4.00	−0.50	Action	116

Other gauges in Norfolk County

Flood gauges in Norfolk County

Dover	5.0	9.24 ft, Aug 23, 1955	6
Medway	5.0	7.21 ft, Mar 31, 2010	2
East Braintree	4.5	5.60 ft, Mar 17, 2010	0
Norwood	9.0	14.65 ft, Aug 19, 1955	5

Norfolk County: every hazard · River floods across the country · Massachusetts

NOAA National Water Prediction Service, gauge WTHM3, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.