u/REAL-Jesus-Christ

As I sit in my office near the Tea exit and hear the constant drone of traffic from I-29, I got to thinking about what the world would have sounded like 100 or 1,000 years ago. I asked AI for some insight and thought it was interesting enough to share.

The local soundscape of Sioux Falls and the surrounding region transformed from a prairie environment ruled by water and wind into a bustling, industrial-era hub, driven heavily by river power, massive quarry operations, and agriculture. [1, 2]

Pre-Settlement & Indigenous Era (2000 BCE – 1850s CE)

Before the city charter, the local acoustic footprint was entirely organic, shifting seasonally across the open plains. []

• The Big Sioux Cascades: The absolute loudest continuous sound in the region came from the waterfalls of the Big Sioux River, specifically at what is now Falls Park. During spring snowmelts, the roaring water dropping over the pink quartzite ledges hit ~85–90 dB up close. []
• Prairie Weather Extremes: Violent summer thunderstorms over the flat terrain created booming thunder cracks that rolled unobstructed across the grassland, reaching ~110–120 dB.

The Great Dakota Boom (Late 1800s)

The arrival of the railroads in 1878 and the rapid industrialization of the riverfront permanently altered the local environment. [, 2]

• The Plague of 1874: During the devastating grasshopper invasions of the 1870s, billions of insects descended on the city. Pioneers recorded that the sheer collective noise of the swarm eating crops and wood sounded like "thousands of scissors cutting all at once," generating an omnipresent, high-pitched scratching drone over the entire area. [1]
• Milling and Churning: The construction of the massive Queen Bee Mill right next to the falls in 1881 introduced heavy, automated wheat-crushing machinery. The combination of churning water turbines and industrial rollers inside the stone complex created a continuous ~95–100 dB rumble. []
• Quartzite Extraction: As the city grew, the excavation of its signature pink Sioux Quartzite required constant blasting and heavy hammering, punctuating the daily atmosphere with explosive thunderclaps.

The Meatpacking and Transit Era (1900s)

As the region shifted from rural to urban, centralized mechanical and agricultural noise began to dominate. []

• The Morrell Plant Din: The opening of the massive John Morrell meatpacking plant in 1909 brought a massive influx of livestock transport and machinery. The complex infrastructure of holding pens, steam-cleansing lines, and automated processing equipment created a distinct industrial roar of ~90–95 dB on the city's north side. []
• The Airbase Boom (1942): During World War II, the establishment of the local military airbase and radio communications training school introduced the frequent, deafening roar of military aircraft engines over the city, easily hitting ~110–115 dB during takeoffs. []

The Modern Interstate Soundscape (Present Day)

Today, the local environment is shaped heavily by its position as a major transportation crossroads. [1]

• Interstate Junction Hub: Nestled at the junction of Interstates 29 and 90, the continuous, low-frequency hum of diesel semi-truck traffic and high-speed highway noise creates a constant urban baseline backdrop of ~70–80 dB along the city perimeter. []
• Atmospheric Sonic Booms: Because of regional military training flight paths across the Dakotas, the upper atmosphere occasionally produces unexpected, sudden sonic booms that rattle windows on the ground, clocking in as brief spikes well over ~120 dB. [1]