Plunges and Spa-The Stroppel Hotel and Mineral Baths

'Tis the season to warm up with the hot mineral bath plunges!!!

Plunges and Water Composition

Feeling sore?  Have Aching joints?  Does cold weather make it worse?  Do you suffer from diabetes?  Are you overweight?  Suffer from arthritis, gallbladder pain, liver issues, or respiratory issues?  Come try our naturally hot and mineral rich geothermal waters!  


To preserve general health, we believe there is no more valuable mineral water than the Stroppel Mineral Water; see below for the composition.   The temperature of the water is 119 degrees at the wellhead, but it is cooled before flowing into the plunges.  For optimum healing one plunge is kept around 107 degrees and the around 110. Our plunges are in a Bath House addition off our lobby.   Each plunge has its own changing room that yourself or your group will have private access to during your spa experience.  

The plunges are kept at these healing temperatures to soothe many ailments.   Increasing your body temperature helps naturally eliminate toxins, increase circulation and reduce blood pressure. Essential minerals have many health benefits and can be absorbed through your skin, giving your body a natural health boost.  Our healing waters can help with the healing effects of reducing blood pressure, lowering blood sugar, increasing circulation, opening the respiratory system.  The geothermal waters act as a natural anti-inflammatory and disinfectant to relieve pain and pressure from joints and muscles. 

Skin ailments of many sorts and tired aching muscles have been relieved. Cuts heal very quickly. Blood poison has been drawn out and many more ailments too numerous to mention have been relieved over the decades.

After approximately 21 hot mineral baths, people who entered on crutches and canes have walked out under their own power. Many are finding a week's respite with daily plunges are vital in subsiding pain and gaining stress-free peace.  

If people cursed with the aches and pains of rheumatism and arthritis would spend one week a year at our geothermal mineral baths, a lot of needless suffering could be relieved. People who have been helped are our best advertisement.  

Please see "Spa Services"  tab for Spa Experiences and respite options.  
The South Dakota School of Mines and Technology in Rapid City provided the following mineral content analysis of the Stroppel Well.
P.P.M.                G.P.G.
Total Solids2686.00156.60

Alkalinity as CaCO3
PhenolphthaleinNone                 None
Methyl Orange1170.0068.20
Hardness as CaCO324.001.40
ManganeseNone                  None
Hypothetical Combinations:
Sodium Chloride1395.0081.35
Sodium Sulfate3.000.18
Sodium Carbonate1255.0073.20
Calcium Carbonate16.000.93
Magnesium Carbonate5.000.29
ManganeseNone                  None
The water is soft and contains large amounts of sodium chloride (common salt) and sodium bicarbonate (saleratus- baking soda).
P.P.M - Parts Per Million
G.P.G. Grains per gallon



  • Silica - Can prevent the thinning of hair and plays a vital role in assisting calcium in bone growth. Strengthens bones, boosts the immune system, promotes healthy nerves, mucous membranes, hair, and nails. Silica is used in treating acne and migraines.
  • Sulphate - Relieves pain, detoxifies on a cellular level and is essential for production of collagen and maintaining healthy skin, hair and nails. Sulfur is essential in ridding the body of toxins and for the health of bones, hair, nails and the fluids in joints and vertebral discs. Sulfur is an anti-inflammatory.
  • Chloride - One of the most important electrolytes in the blood and helps maintain proper blood volume, blood pressure, and pH of body’s fluid system. Chloride has musculoskeletal benefits.
  • Calcium - Promotes healthy bone growth and overall health.
  • Magnesium - Helps maintain normal muscle and nerve function and plays an important role in metabolism and protein synthesis, increasing energy levels. Maintains normal heart rhythms and converts blood sugar to energy. Magnesium is needed to utilize carbohydrates properly, to make our protein from amino acids, to maintain muscle tissue and balanced hormone levels.
  • Iron - Boosts hemoglobin in the blood, which carries oxygen through your body, and increases resistance to stress and disease as well as preventing fatigue. Without iron, the blood could not deliver oxygen throughout the body. Builds up the quality of blood and increases resistance to stress and disease. Iron prevents fatigue and promotes good skin tone.
  • Fluoride - Promotes hardness and stability of bones and teeth. Calcium fluoride is a constituent of the elastic fibers of the skin, the surface of bones and teeth.
  • Sodium - An extremely important electrolyte in the blood and plays a pivotal role in enzyme operations, nerve and muscle functions. Equivalent levels and buoyancy to the salinity in sea water. Salt soaks have been known to relieve symptoms of arthritis.
  • Sodium chloride – Is chemical name for salt. Sodium is an electrolyte that regulates the amount of water in your body. Sodium also plays a part in nerve impulses and muscle contractions. Sodium chloride is used to treat or prevent sodium loss caused by dehydration, excessive sweating, or other causes.
  • Sodium Sulfate – “Miraculous Salt” has strong laxative effects.
  • Sodium Carbonate – Sodium carbonate is an organic sodium salt and a carbonate salt also known as washing soda used as a cleaning agent and dry soap powders. Sodium Carbonate is used to soften water and to manufacture sodium compounds like borax.
  • Calcium Carbonate – Is a dietary supplement used when the amount of calcium taken in the diet is not enough. Used as an antacid to relieve heartburn, acid indigestion and upset stomach. Calcium carbonate can prevent and treat osteoporosis and loss of bone mass.
  • Magnesium Carbonate - helps relax muscles and is vital for the function of a neurotransmitter that calms activity in the central nervous system. Studies show magnesium carbonate helped older adults fall asleep faster, wake up later, and sleep better overall.


The Stroppel Hotel hot mineral baths are open to the public (no hotel room reservation required) 7 days a week, all year long.
Off-season may see reduced hours, calling ahead is recommended.