| May 1965 | Tornado (F2) | not stated | 8 hurt, $25,000 | no account filed |
| May 1998 | Thunderstorm Wind | Countywide | 4 hurt, $914,000 | no account filed |
| June 1989 | Tornado (F1) | not stated | 4 hurt, $25,000 | no account filed |
| August 1966 | Tornado (F2) | not stated | 1 hurt, $250,000 | no account filed |
| June 2001 | Thunderstorm Wind | Reedsburg | 1 hurt | no account filed |
| June 1999 | Lightning | Lake Delton | 1 hurt | no account filed |
| June 1989 | Thunderstorm Wind | not stated | 1 hurt | no account filed |
| June 2008 | Flash Flood | Lake Delton | $22,400,000 | Sauk County experienced 4 flash flood events over a 3-day period. Two of the events started on June 7th, one on June 8th, and the last one on June 9th. In each case, flash flooding caused home and business damage as well as crop losses. Roads were blocked or washed out (STH 154 and CTH C), and bridges were damaged. Many vehicles stalled. Locations in the Baraboo River Valley sustained considerable damage as the river crested at all-time levels. Collectively, each of these 4 flash floods resulted in home and business damage along with some crop losses. It was nearly impossible to break down the damages by flash flood event. Therefore, the collective breakdown is provided in the June 9th StormData entry for Sauk County.||On June 9th, the levee holding back Lake Delton eroded over a 5 hour periiod and eventually broke (the actual dam held), allowing Lake Delton to empty into the Wisconsin River. A 300-foot section of CTH near the breach was washed away. At least 4 homes were washed away, and damage was inflicted on boats and piers. There were no injuries or fatalities.||The breakdown for residential home losses for the 3-day period were: over 800 minimally affected, 45 with major damage, and 31 destroyed (total of $19.2 million for home losses). Business losses are estimated to be about $1 million. Crop losses were estimated at $15 million. Public sector damage was about $2.25 million. Several roads and bridges sustained damage. |
| June 2000 | Flash Flood | Countywide | $9,250,000 | no account filed |
| July 1994 | Tornado (F2) | Prairie | $5,000,000 | no account filed |
| August 2018 | Flood | La Valle | $4,900,000 | Flood levels continued to rapidly rise on the Baraboo River with near record crests reached in La Valle during the late morning hours on August 29th, and near record in Reedsburg late in the afternoon on August 29th. Evacuations continued in the early morning hours in La Valle on August 29th, while 10-15 persons were evacuated during the early morning hours on August 30th in Rock Springs and North Freedom. Many state and county highways, and bridges, were closed in the aforementioned communities near and along the Baraboo River. The Baraboo River also began to flood farther downstream in the Baraboo area. Other roads, bridges, and lowland areas across northern Sauk County remained flooded and closed from the heavy rains of the last several days. Overall, 116 homes sustained minor flood damage from late August into early September mainly in the communities of La Valle, Reedsburg, Rock Springs, and North Freedom. Many businesses also sustained minor flood damage in these communities. |
| August 2007 | Lightning | Sauk City | $1,900,000 | Lightning struck a commerical peg farm near Sauk City, killing about 1900 pigs. The exact location of the farm isn't known. |
| August 2018 | Flood | La Valle | $1,000,000 | Flood levels were quickly rising on the lower Baraboo River basin and falling in the upper portions of the river basin. A near record crest of 27.6 feet occurred in Rock Springs during the late afternoon of August 31st, while a new record crest did occur in North Freedom at 25.3 feet. The river was approaching crest in West Baraboo late on August 31st. Many state and county highways, and bridges, were closed in the communities near and along the Baraboo River. Many homes and businesses sustained minor flood damage in these communities. |
| October 2006 | Hail | Reedsburg | $900,000 | A hailstorm dumped hail stones with diameters from 1.00 to 1.75 inch from Reedsburg to Baraboo, with most of the activity in the Reedsburg area. Hundreds of vehicles were damaged by the hail stones. Three insurance companies reported 375 claims totaling about $900,000. |
| August 2005 | Tornado (F2) | Leland | $600,000 | This tornado spun up from the same supercell thunderstorm that spawned the "Viola" tornado earlier in Vernon and Richland counties. This Sauk County tornado spun up at 1633CST about 3.6 miles northeast of Leland, or about 1/4 mile south of the intersection of Ruff and Pine Hollow Roads. The tornado headed east-southeast for about 11.1 miles in Sauk County, and crossed the Columbia County line at 1655CST about 4.5 miles north-northeast of Prairie du Sac, between Wiegans Bay and a boat launch site. This tornado crossed CTH C about 0.5 mile west of Stones Pocket Road, and moved through old Badger Ammunition Plant just south of the greatest density of roads within the Plant grounds. This rain-wrapped tornado was video taped and photographed, and damaged many structures, trees, and power-lines. As for residential buildings, 10 received minor damage, 1 had major damage, and one was destroyed. One business building had minor damage. As for agricultural buildings, 5 received minor damage, and 6 were destroyed. This tornado was rated an F2 with estimated winds of 98-136 knots (113-157 mph). Average path width was about 150 yards. |
| August 2018 | Flood | La Valle | $500,000 | Flooding of creeks and lowland continued north of La Valle. This included highway 33 which was washed out due to the flooding of Crossman Creek just south of Stout Rd. Highway F was closed due to bridge damage at an inlet to Lake Redstone. A portion of Highway H near highway 13 was closed due to a road and culvert wash out. |
| August 2018 | Flash Flood | La Valle | $500,000 | Portions of several roads north of La Valle are flooded and washed out after 3 to 6 inches of rain. This includes highway 33 which was washed out due to the flash flooding of Crossman Creek just south of Stout Rd. Highway F was closed due to bridge damage at an inlet to Lake Redstone. A portion of Highway H near highway 13 was closed due to a road and culvert wash out. |
| June 2006 | Flash Flood | Hillpt | $500,000 | Thunderstorms with torrential downpours produced rainfalls of 3 to 6 inches (radar estimated) in west-central Sauk County. Specifically, 4.67 inches of rain fell in Hill Point from 1315CST to 1430CST. Several shoulder gravel washouts occurred on a couple roads in the west-central part of the county as well as on some residential driveways. Several roads had water depths of 1 to 2 feet on low spots. The area that was affected the most was a 2 mile by 10 mile band in the Civil Towns of Ironton and Washington. In this area, four roads had a low spot washed away from the floods. One farm lost 4 acres of a hay/alfalfa crop. |
| June 1996 | Flash Flood | Hillpoint | $500,000 | no account filed |
| August 2007 | Flash Flood | Limeridge | $300,000 | Although general flooding affected all of Sauk County, significant flash flooding affected the west-central part of the county around Limeridge down to Spring Green. Water depths on CTH K, G, S, TS, and STH 154 in the Limeridge to Hill Point area reached 3 to 4 feet. Gravel shoulder washouts occurred and crops across the county were damaged. It was noted that water entered the basements of many homes in the county. Nine homes in Rock Springs were severely damaged, and water came close to 2nd floor of some homes! Elsewhere, 41 had minor damage and 4 had major damage which involved damage to basement walls (total of $250,000 in damage). Two businesses had minor flood damage ($2,000). Livestock losses of $22,000 were reported, and crop losses were estimated at about $3 million for corn and $1 million for soybeans and alfalfa. Winter rye that was cut prior to the heavy rains will be unusable ($300,000). A major washout occurred on Denzer Rd. where it crosses the East Branch Honey Creek. Another major washout on Boot Jack Rd. about 2.5 ESE of Valton. A small section of a dam at Cazenovia was loosened, but held (about $10,000 in damage). All of the excessive rain ultimately resulted in the Baraboo River at Rock Springs reaching major flood status. At this location the river rose to the 18.5 flood stage at 0922CST on August 19th, crested at 21.37 at 0900CST on August 21st, and fell below flood stage at 2348CST on August 24th. At a spotter location 1NNE Reedsburg, 5.11 was measured overnight, and 5.25 was measured in LaValle.||August, 2007, rainfall totals include: 14.73 in Baraboo, 13.42 in La Valle, 16.91 in Prairie du Sac, 15.92 in Reedsburg, and 14.82 at the Lone Rock Airport. |
| June 1989 | Tornado (F2) | not stated | $250,000 | no account filed |
| June 1969 | Tornado (F1) | not stated | $250,000 | no account filed |
| July 2000 | Flash Flood | Limeridge | $175,000 | no account filed |
| June 1996 | Flash Flood | Ironton | $170,000 | no account filed |
| April 2014 | Flash Flood | Baraboo | $150,000 | Numerous roads were closed over southern Sauk County due to flash flooding of small creeks and streams. Estimated rainfall amounts ranged from 4-7 inches. Some of the known creeks that flooded were Otter Creek, Honey Creek, North Branch of Honey Creek, and Pine Creek. There was one bridge washout at the north end of Stones Pocket Road due to the flooding of Otter Creek. This will cost approximately $150,000 to replace. |
| August 2001 | Flash Flood | Countywide | $150,000 | Two rounds of thunderstorms with very heavy rains pounded south-central Wisconsin, the first one during the evening hours of August 1st, and the second round during the pre-dawn hours of August 2nd, resulting in flooding or flash flooding in Dane, Iowa, and Sauk Counties. Flash flooding occurred in scattered locations across Sauk County, but the worst was between Baraboo and Devil's Lake State Park. A road in Baraboo washed out, allowing a semi-trailer tractor to sink into the mud. Washouts of camp sites occurred in the State Park area, and many other roads across the county had gravel shoulder washouts. In Sauk County, Reedsburg measured 6.07 inches, and 5.96 inches fell in Prairie du Sac. |
| May 2004 | Flash Flood | Plain | $150,000 | no account filed |
| June 1996 | Flash Flood | Valton | $120,000 | no account filed |
| April 2026 | Thunderstorm Wind | North Freedom | $100,000 | A portion of the Fire Department's roof torn off in North Freedom. A few mobile homes with roof damage. Several trees uprooted and many tree limbs and powerlines down. Some trees down on homes. |
| April 2026 | Thunderstorm Wind | Prairie Du Sac Arpt | $100,000 | Numerous trees and powerlines down on the north side of Prairie Du Sac including uprooted trees. Some trees down on homes, garages and apartment buildings causing structural damage. Sheet metal removed from a portion of a roof of an industrial building. |
| August 2007 | Thunderstorm Wind | Reedsburg | $100,000 | Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines. |
| August 2007 | Thunderstorm Wind | Lake Delton | $100,000 | Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines. |
| August 2007 | Thunderstorm Wind | Ironton | $100,000 | Powerful thunderstorm wind gusts to 61 knots (70 mph) toppled many trees and damaged several power-lines. Some corn fields in the surrounding countryside were flattened by the winds. |
| April 1997 | Thunderstorm Wind | Spring Green | $80,000 | no account filed |
| September 2001 | Thunderstorm Wind | Lake Delton | $75,000 | no account filed |
| June 1996 | Tornado (F1) | Prairie Du Sac | $75,000 | no account filed |
| July 2023 | Thunderstorm Wind | Merrimac | $60,000 | A swath of widespread tree damage from Moon Valley to Merrimac. Numerous trees and branches snapped or uprooted. A large tree fell through a shed destroying it. A large tree branch fell onto a truck and another onto a garage. A Pontoon Boat was overturned on the shore of Lake WI. |
| August 2014 | Thunderstorm Wind | Rock Spgs | $50,000 | Dozens of trees and power lines down in Baraboo, Lake Delton, and surrounding areas. Trees reported down on houses and cars, and Interstate 94. Law enforcement reported trees were down throughout the county. |
| May 2007 | Thunderstorm Wind | Lake Delton | $50,000 | Large trees were uprooted. One vehicle was damaged when a tree fell on it. A couple electrical transfomers were damaged by felled trees. |
| July 2006 | Thunderstorm Wind | La Valle | $50,000 | Trees and power lines reported down countywide. |
| June 2005 | Thunderstorm Wind | Spring Green | $50,000 | Numerous large trees were toppled along with power lines. |
| August 1997 | Hail | Loganville | $50,000 | no account filed |
| July 1997 | Thunderstorm Wind | La Valle | $50,000 | no account filed |
| July 1997 | Thunderstorm Wind | Lake Delton | $50,000 | no account filed |
| August 1996 | Thunderstorm Wind | Reedsburg | $50,000 | no account filed |
| September 1994 | Thunderstorm Wind | Ironton | $50,000 | no account filed |
| April 2026 | Thunderstorm Wind | Rock Spgs | $40,000 | One silo destroyed and another heavily damaged on a farmstead. A tensile structure damaged and many trees or limbs down. |
| May 2013 | Thunderstorm Wind | Hillpt | $40,000 | The Sauk County 911 center received reports of tree and power line damage in a 10-mile wide swath from 5 miles west of Hill Point to 8 miles east of Baraboo due to powerful thunderstorm wind gusts that were estimated at 70 mph (61 knots). A shed was blown down on Coon Bluff Road northwest of Baraboo. The line of thunderstorms produced a gustnado 7 miles east of Baraboo, however only some minor tree damage was reported with the gustnado. |
| May 2013 | Thunderstorm Wind | Spring Green | $40,000 | Law enforcement officials reported trees downed by powerful thunderstorm winds that gusted to an estimated 65 mph (56 knots) in Spring Green. One building was damaged by a falling tree. |
| June 1998 | Thunderstorm Wind | La Valle | $40,000 | no account filed |
| April 2026 | Thunderstorm Wind | Loganville | $30,000 | An outbuilding destroyed and multiple trees down. |
| June 2024 | Flash Flood | Cazenovia | $30,000 | Several roads flooded throughout the county, especially in the Baraboo and North Freedom areas and in low lying areas. Portions of some roads and culverts partially washed out. A railroad bridge was damaged in Devils Lake State Park. Lake Delton and Prairie Du Sac also reported street and yard flooding. Some of the roads in low lying areas remained flooded well into the next day. |
| July 2010 | Flash Flood | Rock Spgs | $30,000 | The Sauk County Emergency Manager reported one to three feet of water over some roads, mainly in the northern portion of the county...with sandbagging operations in Rock Springs along the rapidly rising Baraboo River. A trained spotter reported street flooding along Highway 33 in Baraboo. The flooding was the result of heavy rains from strong to severe thunderstorms crossing the region. A farmer near La Valle lost 30 head of cattle that drowned when they left high ground into the rushing waters of the Little Baraboo River. Minor crop damage was also noted. |
| July 1999 | Thunderstorm Wind | Baraboo | $30,000 | An isolated severe thunderstorm's powerful downburst winds tore off 3/4ths of a farm home's roof and and levelled many trees. |
| July 2021 | Thunderstorm Wind | North Freedom | $25,000 | Numerous reports of multiple trees, limbs, and powerlines downed. The hardest hit areas were from North Freedom to Loganville to Baraboo. There was one report of roof damage to a garage and a chicken coop that was blown over. |
| June 2008 | Thunderstorm Wind | La Valle | $25,000 | Powerful thunderstorm winds knocked down large trees and power-lines. |
| July 2008 | Flash Flood | La Valle | $25,000 | A series of thunderstorms dumped 2 to 4 inches of rain in Sauk County that resulted in flash flooding. Several county roads were closed due to fast-flowing water depths of 1 to 2 feet. Basement flooding was noted, and there was some shoulder gravel washouts. A semi-tractor trailer stalled in deep water on a road near Loganville after the current pushed the truck off the road, and the driver had to be rescued. |
| August 2006 | Lightning | Sauk City | $25,000 | Lightning struck a home, resulting in a minor fire. |
| May 2004 | Flash Flood | Lake Delton | $25,000 | Basements flooded along with gravel washouts and roads closed as water levels rose to 1 foot deep. |
| May 2004 | Lightning | Reedsburg | $25,000 | no account filed |
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