A National Historic Landmark. Built in 1947. Listed on the National Register of Historic Places in 1966.
From the record
“Aztalan State Park is a state park in Jefferson County, Wisconsin, United States. Established in 1952, it was designated a National Historic Landmark in 1964 and added to the National Register of Historic Places in 1966.”
Wikipedia article Aztalan State Park, CC BY-SA 4.0.
One of 52 National Register listings published here for Jefferson County · listed in 1966 · category: Site · built in 1947 · a National Historic Landmark.
National Register reference number.66000022- the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.
The first town election was held in the spring of 1842. at Aztalan, the township then comprising what are now the towns of Lake Mills and Waterloo, and the west half of Milford. M. R. Clapp, of Milford, was the first Chairman of the Town Supervisors.
Regional context, not property-specific
evidence. The
federal wildfire occurrence database
lists 10 fires within 5 miles of Aztalan
between 2010 and 2020, burning about 261 acres in total. None started naturally. 2 were recorded as arson.
Distance is straight-line from the map coordinates, so a fire counted
here may appear on a neighbouring settlement's page as well.
Reported cause
Fires
Missing data/not specified/undetermined
6
Arson/incendiarism
2
Equipment and vehicle use
1
Smoking
1
The most recent of
them, most recent first, with the day each was reported and the service
that recorded it.
Regional context, not property-specific
evidence. The federal mineral resources record lists
3 workings within 5 miles of Aztalan: 2 producers, 1 past producer.
2 still produce. What was taken out: Sand and Gravel, Construction, Stone, Crushed/Broken. Distance is straight-line from the
map coordinates, so a quarry counted here may appear on a neighbouring
settlement's page as well.
Regional context, not property-specific
evidence. The National Weather Service names
Lake Mills, the town this property stands in, in 66 storm reports between 1994 and 2026: 26 thunderstorm wind, 25 hail, 5 funnel cloud, 3 lightning.
No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office
filed it, from the NOAA Storm Events Database, and each date
opens the federal record of that event.
Heavy rains resulted in flash flooding across much of Jefferson County. Water depths on road surfaces reached 3 feet or more and there were gravel washouts. The rain on June 12th ultimately lead to record-setting crests on the Rock and Crawfish Rivers, and many farm fields remained flooded into early July. The cities of Watertown, Jefferson, and Ft. Atkinson were hard hit by high river levels. The breakdown on residential home damage losses were: 100 with minor damage, 400 with major damage, and 10 destroyed (total of about $36 million). Business losses totaled abouit $21.4 million. Crops losses were estimated at $35 million. Public sector damage was about $44.811 million. There were several roads and bridges that sustained damage.
Flash flooding affected a swath of Jefferson County from the Lake Mills area to the city of Jefferson after 3 to 6 inches of rain fell overnight. Shorewood Road near Lake Mills was closed where a retention pond overflowed and flooded the road with water 2 to 3 feet deep. Most low roads in county had water over them. Bark River Road in Fort Atkinson was closed. Some soil erosion and crop damage was noted in the surrounding countryside. At least 10 homes sustained minor flood damage to basement contents, and at least 3 businesses had minor damage. Some gravel shoulder washouts were also noted. At a location 3.6WNW Lake Mills, 5.23 of rain was measured overnight through 0145CST on August 19th. It was noted that peak rainfall rates at this location reached 2.98 in 2.3 hours. Ultimately , the CoCORaHS observer at this location measured 6.04 by 1000CST on August 19th. A City of Jefferson spotter measured 5.50 overnight. In the extreme southeast corner of the county, a NWS employee measured 3.81.
Flash flooding occurred in the Lake Mills to Watertown area due to repeated thunderstorms with heavy rains on top of a saturated ground. Numerous roads were covered with fast-flowing water depths of 6 inches to 1 foot. Hourly rainfall rates were 1.5 to 2 inches based on WSR-88D Doppler radar estimates. Soil erosion and crop damage also occurred on several other farms in that area. Additionally, a few basements had water damage to contents. Most creeks and streams in the area exceeded flood stage by one to 2 feet.||August, 2007, rainfall totals include: 10.64 in Ft. Atkinson, 12.68 in Jefferson, 17.75 in Lake Mills, 14.39 in Watertown, 12.54 in Waterloo, and 12.78 at the NWS office 3.8SE of Sullivan.
Law enforcement officials reported numerous trees and power lines blown down by thunderstorm wind gusts estimated up to 65 knots (75 mph) in the city of Lake Mills.
The Jefferson County 911 Call Center reported trees and power lines were blown down by damaging thunderstorm wind gusts estimated to be 56 knots (64 mph) in Lake Mills.
The public reported trees, some up to 12 inches in diameter, and numerous branches blown down by thunderstorm wind gusts estimated at 60 mph (52 knots). A road sign was twisted by the winds along Interstate-94 just west of Lake Mills, and some lofting of tree debris was noted by a storm spotter.
Ham radio operators reported severe thunderstorms dropped hail up to 1.00 inch in diameter in a 3-mile wide swath from 3 miles southwest of Lake Mills to 1 mile northeast of Lake Mills.
A trained spotter reported large tree branches blown down, an above ground pool blown into a neighbor's yard and lawn furniture tossed from severe thunderstorm wind gusts estimated at 65 knots (75 mph).
Sheriff deputies reported trees blown down by strong thunderstorm wind gusts estimated at 56 knots (65 mph) along a line from Lake Mills to Oakland Township.
Scattered severe thunderstorms raced from west central to south central and southeast Wisconsin generating hail up to 1 inch in diameter and gusty winds to 60 mph. Over $100,000 in property damage occurred to 43 homes in the Star Prairie area of St. Croix county due to intense thunderstorm winds. Other damage was confined to trees and power lines.
No historic map-sheet match is published
for this property yet. That does not mean no map exists. This record needs
a coordinate-quality review before it can be joined to a sheet boundary.
Browse the county's mapped places while that work is
pending.
Listed places nearby
6 within 8 miles
Other National Register properties close
enough to walk or drive between, ordered by distance from this one. Both
positions come from the same geocoding pass that matched these properties
to their map sheets.
Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.
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