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Bigfoot Sightings and Cesium-137 Contamination in the United States | Unidentified Animals

Other strange creatures in Bigfoot locality: Strange flesh-colored creature spotted -- Chupacabra? (opens separate page)



(c) Diane Arnold 2005

“Does Bigfoot possess the capacity to differentiate between good and bad radiation in the environment?”  


The following study is an attempt to correlate information that would provide better insight into a link between cesium-137 contamination in the United States and the presence or absence of Bigfoot.  We wonder if cesium-137 contamination levels might be a factor in the absence of Bigfoot in areas with notably high levels of cesium-137 deposition.   Non-radioactive cesium may appear naturally in soil and water and in combination with minerals or as a mineral bi-product, and be beneficial to animals.  Radioactive Cesium-137 is due to radioactive fallout from “atmospheric nuclear weapons tests in the 1950’s and 1960’s which dispersed and deposited cesium-137 world-wide.”(1)  This form of cesium is not thought to be beneficial to the environment or animals.

In this study, we concentrate on the areas of the US that have the highest cesium-137 contamination from the 1950-60’s era.  We will then compare this information with official sighting reports of Bigfoot.  These areas will include counties located in Colorado, Missouri, Nevada, and Utah.  The questions are, “Do Bigfoot posses the capacity to differentiate between good and bad radiation in the environment?” and “Has too much time elapse to find out?”    

Note: If you do not need an introductory lesson about Cesium-137 or Bigfoot, please feel free skip the information found between the asterisk (*) below.   



About Cesium:

Cesium (Cs) is a silvery, white metal that appears naturally in the environment with minerals.  When Cs appears in its stable form it is considered to be non-radioactive. When Cs appears in an unstable form it is considered to be radioactive and it is given the designation Cesium-137. Cesium-137 is utilized in many industrial situations but it is monitored to ensure that it is not released into the environment in amounts that would be toxic to the environment.  Radioactive cesium-137 has a “half-life of 30 years.”(2)  In nature, cesium-137 contamination from 1950 to 1960 would eventually begin to dissipate naturally by 1980 to 1990.

In the environment, cesium-137 decontamination can also be achieved through the use of soil enrichment techniques.  The enrichment process seeks to reduce the harmful effects of cesium-137 on plant life, and in turn can decrease the contamination danger for animals.  In the south, soil enrichment includes crop reserve programs, and the use of chemicals to artificially enrich the soil.  There are areas in the United States, however, that became highly contaminated and there was no way to feasibly decontaminate them except to let the cesium-137 dissipate naturally.  These areas included remote regions with little or no ground cover.    

In the human body, small amounts or inhaled or ingested Cesium-137 is thought to be processed as waste material in an impressively short period of time. Radioactive cesium is used clinically in strictly regulated doses for treating cancer, but it is harmful in inexperienced hands or in unregulated amounts.  Radioactive cesium can also have damaging effects on the food chain.  Livestock, especially dairy cows, can produce milk contaminated with cesium-137.  This was a special concern in the 1970’s worldwide.  To help protect drinking water, common water filtration systems assist in removing radioactive cesium from drinking water.  

About Bigfoot:

For those of you who do not know what a Bigfoot is, it is currently listed as an “unknown” animal.  That means that it has a temporary classification that places it in the realm of crypto zoology, an area of study that concentrates on gathering information about unclassified animals.  Bigfoot is known by many names including Sasquatch, skunk ape and yeti.  

Bigfoot, commonly referred to as BF, is described as being human-like primates. That means that these mammals have qualities that are similar to both human and primate. They walk on two legs, use all five fingers (having an opposable thumb) are reportedly covered with hair all over their bodies, and leave distinctive foot prints when they walk. We are slowly collecting more and more data to support the existence of Bigfoot.

Additionally, Bigfoot is studied world-wide by many groups of people including those who may or may not have ever encountered one.  Some of the studies seek to capture a living Bigfoot, while others hope to collect valuable samples from body fluid to be used for DNA mapping and further research.  There are also people who assist in the study of Bigfoot by collecting data, compiling it for further study and dissemination to other groups.  All of these people provide a valuable service in the effort to confirm this animal’s existence so that it may be given a classification.   



Though Cesium-137 was dispersed world-wide, we chose to concentrate our study on a more manageable area, the United States, specifically the four main areas with the highest deposition of Cesium-137.  We then compiled a list of Bigfoot sightings that concentrated on the areas that corresponded with the Cesium-137 deposition.  The areas of study have known Cesium-137 deposition in the soil at levels at or above 800-1300 Bq m(-2). (3)  The Bigfoot sightings information, used for comparative purposes, is from the Bigfoot Field Researchers Organization (BFRO).  The reports concerning the Cesium-137 affected counties appear in Blue.”

Maps that were of great importance to this brief study include:  The Cesium-137 Deposition Density Due to all NTS Tests; The US Census Bureau Quick Facts Colorado, Utah, Nevada, and Missouri Counties Map, and the Big Foot Researchers Organization (BFRO)  Sightings Map for Colorado, Missouri, Nevada and Utah. (The necessary sources have been referenced below and include URL’s current as of 11/25/2005.)


BFRO Sightings Colorado:



[Outside Pagosa Springs 12/20/2000; Outside Pagosa Springs 01/25/2001;East of Vallecito Reservoir –San Juan National Forest 06/01/2004.]



Clear Creek-1


[Conejos River.-San Juan National. Forest 06/00/1994; Lake Fork Trail 07/13/1997: TWP 35-36 08/04/1998; Rio Grande National Forest 04/19/2000.]






[Gypsum 00/00/1987; near Gypsum 04/21/2000; near Eagle 08/19/2000; near Eagle 11/05/2001.]

El Paso-5




[Between Crested Butte and Gothic 08/00/1964. Near Gunnison 11/00/1991.]


[Near Lake City 08/05/2000. Spring Creek Pass 01/05/2003.]





[Near Turquoise Lake 00/00/1975. Near Leadville 11/23/1994. Near Leadville 06/00/1994. Near Leadville 08/00/1998. Near Twin Lakes 05/29/2002. Near Leadville 08/11/2005.]


Las Animas-1








[Eagle River 04/00/2000. Near Aspen 08/22/2000. Near Basalt 01/20/2001. Near Hunter-Fryingpan Wilderness Area 09/17/200/2.]



San Juan-1


[Near Leadville 09/19/1998.One report appears to be a publication of a previous report.]




BFRO Sightings Missouri:
































St. Charles-1

St. Clair-2

St. Louis-2

Ste. Genevieve-1





BFRO Sightings Nevada:




[Nevada Test Site 01/30/1980.]




BFRO Sightings Utah:


Box Elder-1


[Near Farmington 04/14/1975. Weber 02/03/1980. Weber 02/04/1980. One appears to be a publication of a previous report.]







*Utah -5

[Near Pleasant Grove 03/05/1981 and 05/00/1996. Near Provo10/21/1982. Near Fairview 10/00/1989. Near Provo 07/05/2004.]






We initially looked to see if Bigfoot reports were listed in areas with Cesium-137 deposition.  Of the states cited, Colorado, Nevada and Missouri had Bigfoot sightings in areas with cesium-137 deposition.  Missouri, unlike the other states, did not have correlated sightings data in the deposition areas.

Of Colorado’s 63 counties, 76 sightings reports were on file with BFRO as of 11/13/2005.  Only 9 counties were cited with excessive Cesium-137 deposition levels; Archuleta, Conejos, Eagle, Gunnison, Lake, Pitkin and Summit.  A total of 26 reports are from the deposition areas and 50 reported sightings were outside of this area.     

Of Nevada’s 17 counties, 6 sightings reports were on file with BFRO as of 11/13/2005.  Only 2 counties were cited with excessive Cesium-137 deposition levels; Lincoln and Nye.  Only 1 report (the Nevada Test Range) is from the deposition area and 16 reported sightings were outside of this area.

Of Missouri’s 115 counties, 51 sightings reports were on file with BFRO as of 11/13/2005.  Only 2 counties were cited wit excessive Cesium-137 deposition levels; Knox and Lewis.  There are no sightings reports for the deposition areas so all 51 reports are from outside of this area.

Of Utah‘s 29 counties, 30 sightings reports were on file with BFRO as of 11/13/2005.  Only 2 counties were cited with excessive Cesium-137 deposition levels; Davis and Utah.  A total of 8 reports for the deposition areas and 22 were from outside of this area.  

It appears, with the exception of Missouri, that our study of Cesium-137 and the presence of Bigfoot have presented rather contradictory results.  Sightings reports do seem to conclude that Bigfoot appeared in relatively small numbers in areas where Cesium-137 deposition was historically present.

In the study, we included even the most recent sightings reports.  If we concentrate specifically on the earlier sighting histories there are only 9 reported sightings in the three states during the suspected 30-year period; 1950-60 to1980-1990.  In the deposition areas, Colorado had three reports; 1964, 1975 and 1987. Nevada had only one report, in 1980, and that was at the Nevada Test Site.  Utah had five reports; 1975, 1980, 1981, 1982 and 1989. 

It does appear that Bigfoot were more prevalent in areas with lower levels of Cesium-137 deposition.  Bigfoot sightings reports in the deposition areas did appear to increase somewhat after 1980.  It appears that Bigfoot may have been able to differentiate between good and bad radiation in the environment.

The final question remains, “Has too much time elapse to find out?”  According to the information we have compiled thus far, the data appears to speak for itself. The steady increase in sightings reports over a 30 year period and the gradual dissipation of Cesium-137 do appear to correlate.  Bigfoot is appearing or reappearing in some of these areas and the population is slowly increasing.          



(1) (2) United States Environmental Protection Agency, Radiation Information, Cesium. The Basics-“What are the properties of cesium-137?” 23 September 2005. http://www.epa.gov/radiation/radionuclides/cesium.htm

(3)  NTS Deposition Map; Cesium-137 deposition density due to all NTS   tests. "out" (PDF) www.ieer.org/offdocs/csdepnts.pdf

(4)   BFRO Reported Sightings by Colorado counties:  http://www.bfro.net/GDB/state_listing.asp?state=co

(5)   BFRO Sightings Map for Colorado:       

      (6)  US Census Bureau Quick Facts Colorado counties map:

      (7)  BFRO Reported Sightings by Missouri counties:

      (8)   BFRO Sightings Map for Missouri:

      (9)   US Census Bureau Quick Facts Missouri counties map:

      (10)  BFRO Reported Sightings by Nevada counties:

      (12)  BFRO Sightings Map for Nevada:

      (13)  US Census Bureau Quick Facts Nevada counties map:

      (14)  BFRO Reported Sightings by Utah counties:       

      (15)  BFRO Sightings Map for Utah:

      (16)  US Census Bureau Quick Facts Utah counties map:      


 Unidentified Animals Page, by Diane Arnold: Actual photographs of unusual or unidentified animals, sighted and photographed in Dickens County, TX. (NOTE: this page may be outdated/defunked)



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(c) Sharon (Eby) Cornet 2011