20894 South River Road

Closed 3/7/23
Closed 3/7/23
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Sold
Last Sold Price
$10,000,000
4 beds
20894 S River Rd, Mammoth, AZ 85618
FarmProperty Type
32,000 acresLot Size
1961Year Built

Description

Mercer Ranch, also known as the famous Campstool Ranch, has been in the Mercer family since the early 1900's. The ranch is in Pinal County, near Mammoth,Arizona. The property spans 15miles lengthwise from the San Pedro River in the west, into the Galiuro Mountains on the east end and consists of just over 32,000 acres of some of the best open range cattle grazing land in the world. The ranch is abundant with water sources:nearly 50 natural springs, 20 dirt stock tanks, 2 solar well pumps with panels,...Mercer Ranch, also known as the famous Campstool Ranch, has been in the Mercer family since the early 1900's. The ranch is in Pinal County, near Mammoth,Arizona. The property spans 15miles lengthwise from the San Pedro River in the west, into the Galiuro Mountains on the east end and consists of just over 32,000 acres of some of the best open range cattle grazing land in the world. The ranch is abundant with water sources:nearly 50 natural springs, 20 dirt stock tanks, 2 solar well pumps with panels, a 71 acre Zimmatic Center Pivot irrigation system, dams, wells and distribution piping support livestock and wildlife over a very large portion of the total 32,000 acres. Water rights have been filed and sustained since 1870. The various wells pump from 3 to 3,000 GPM and there are multiple water storage tanks from 15-10,000 gallon capacity. Approximately 60 miles of 4 and 5 strand barbed wire fence establish border and pasture divisions. Historic sites on the ranch include the two ghost towns of Sombrero Butte and Copper Creek, the old Blue Bird silver mine, the old stage coach stop at Monte Bonito, one of the last pony express routes that ran through the Sombero Butte area and a multitude of old abandoned homesteads. There are three dwellings on the property and a multitude of other outbuildings, corrals, additional storage structures, horse corrals and livestock areas. The property includes a 4200 sqft enclosed metal hangar with multi directional adjoining dirt runways that could be used as an indoor horse facility if desired. The full scope and variability of this property is impossible to describe and must be seen to be understood. The current owner is a 4th generation rancher that grew up on the ranch. The property runs between 500 and 1,000 cattle at a time. The ranch is lush in natural vegetation and with the varied elevation (~2,500'-~6000'), it has very diverse vegetation and wildlife. A small sampling of the vegetation on the property includes Sycamore, Cottonwood, Oak, Juniper, Pinon Pine, Cedar, Palo Verde and Mesquite trees. Cholla, Barrel, Prickly Pear and Sahuaro cacti are abundant. Filaree, Indian Wheat Grass, Mediterranean Grass, Sideoats, Black Grama. Sli, Tridens, Threeawn, Bush Muhly and Burrow grasses are present. There is a 2 bedroom home with 1 and 3/4 bath (remodeled in 2007). The second dwelling is a 16x70 3 bedroom 2 bath Palm Harbor mobile home. The third home is the original 2 bedroom 1 bath adobe ranch headquarters built in the early 1900's, but not currently habitable. OUTBUILDINGS
32x12 mobile office
40x50 commodity grain storage with concrete floor and sides. Mechanical shop
Small barn and brick infirmary
40x80 hay barn
40x160 hay barn
30x60 enclosed storage
60x80 enclosed hangar
CORRALS
Headquarters shipping corrals w/Trutest cattle scale
100x80 covered cattle processing facility
500-head feed lot with shades and feeders
4-5 to 10 acre cattle traps
10 sets of corrals across the ranch at key locations

LAND
The ranch is fully gated, with access closely controlled and by permission only.
5,991 acres- deeded (71 acres irrigated farmland)
19,984 acres- AZ grazing lease Campstool Allotment #05-2851
2,295 acres- BLM Copper Creek Allotment
3,367 USFS Coronado Copper Creek Permit
240 acres- AZ grazing lease #05-109745-01
702 acres-additional BLM lands
Total 32,579
Extensive past successful mining history with strong ore deposits (confirmed via past core samples) show potential mining opportunity on the ranch as well.
  • Listed by: Calvin Case 520.406.0000 calvinjcase@gmail.com Brokerage DRE #LC659722000 • OMNI Homes International
  • Listed by: Amber R Cordova 520.302.9877 cordovateam4@gmail.com Brokerage DRE #LC659722000 • OMNI Homes International
Listing closed: 03/06/2023 06:48 PM • Source: MLS of Southern Arizona, MLS#: 22210431

Recent comparable sales

Median sold price

$170,000

Avg days on market

125

Sale-to-list ratio

85.3%

Mammoth, AZ

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20000 South River Road, Mammoth, AZ 85618

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110 Verdugo Road, Mammoth, AZ 85618

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Property Information for 20894 South River Road

Property Details
  • MLS Type: Farm
  • County: Pinal County
  • Subdivision Name: Unsubdivided
  • View: Mountain(s), Panoramic, Pasture, Sunset, Sunrise
  • Zoning Description: Pinal County - GR
Building Information
  • Lot Size: 32000.00 AC
Summary
Location and General Information
  • Directions: Highway 77 past Oracle through Mammoth. Cross the San Pedro river & in 1/2 mile turn south on to River Road. Go approx 6 miles, cross dry creek bed (Copper Creek) Mercer Ranch is 1/2 mile on the righ
  • FEMA Flood Zone: TBD
  • Fire Protection: Subscription
  • Latitude: 32.685119
  • Longitude: -110.60798
  • MLS Area Major: Pinal
  • MLS Area Minor: Pinal
  • Municipal Flood Zone: TBD
  • Township: 9
  • County Zoning: Yes
Taxes and HOA
  • Comparable Only Listing: No
  • Legal Description: Long legal description multiple parcels please see agent comments
  • Parcel Number: 307-05-001C
  • Permitted to Use: Commercial, General Business, Mobile/Mfg Home, Multi-Family, Office/Professional, Site Built
  • Tax Year 2: 2021
  • Taxes: $1,985
School Information
  • Elementary School: Apache
  • High School: Mammoth-San Manuel Schools
  • High School District: Mammoth/San Manuel
  • Middle Or Junior School: Mammoth-San Manuel Schools
Parking
  • Number of Carport Spaces: 2.0
Property
Lot Information
  • Adjacent to 2: Federal
  • BLM: 2,997
  • Deeded: 5,991
  • Forest: 3,367
  • Lot Size Acres: 32000.0
  • Lot Size Area: 32000.0
  • Lot Size Dimensions: Call Agent
  • Lot Size Source: Owner
  • Lot Size Square Feet: 1.39392E9
  • Lot Size Units: Acres
  • Public Survey Range: 17.0
  • Public Survey Section: 4
  • Road Responsibility: Owner Maintenance
  • Road Surface Type: Gravel
  • State: 20,224
  • Topography: Rolling
Farm Information
  • Irrigation Acre: 62
  • Irrigation Equipment: inquire
  • Irrigation Source: Center Pivot, Ditch, Gated Pipe, Side Roll
  • Livestock Property: Cattle, Goat, Horse, Ostrich, Poultry, Sheep, Swine
  • Vegetation: Desert, Grassed, Mesquite
  • Water Level: inquire
Property and Assessments
  • Current Farm Ranch Name: Mercer Ranch
  • Property Sub-Type 2: Livestock
  • Property Type: Farm
  • Year Built: 1961
  • Year Built 4: 1961
  • Year Built 5: 1990
  • Year Built 6: 1900
Building Features
  • Bathrooms Total: 3.0
  • Building Improvement: Barn, Bull Pens, Equipment Storage, Hay Storage, Home, Horse Corrals, Livestock Pens, Mobile Home, Workshop
  • Number Bathrooms: 1
  • Number Bathrooms 2: 2
  • Number Bathrooms 3: 1
  • Number Bedrooms 2: 2
  • Number Bedrooms 3: 3
  • Number Bedrooms 4: 2
  • Parcel Improvements: Pond(s) Not Registered, Pond(s) Registered, Al Facility, Cattle Guard, Fuel Tanks, Scales, Stock Waters, Water Storage
  • Source of Sq Ft: Owner
  • Sq Ft 2: 800
  • Sq Ft 3: 1300
  • Sq Ft 4: 2184
  • Structure Name: House 1
  • Structure Name 2: House 2 Mobile
  • Structure Name 3: House 3 Adobe
Utilities
  • Electric Company: APS
  • Gas: Propane
  • Irrigation Well Power: Electric
  • Phone - Location 5: Available
  • Sewer: Septic Tank
  • Water Source: Pvt Well (Registered), Spring
Interior and Exterior Features
Interior Features
  • Bathrooms Full: 3
  • Bathrooms Total: 3
  • Bedrooms Total: 4
Exterior Features
  • Fencing: Barbed Wire
Rental
Rent Information
  • Annual Lease: BLM, State
Tenant Information
  • Occupant Type: Owner

Property History for 20894 South River Road

DateEvent & SourcePriceAppreciation
Mar 6, 2023

Sold

MLS of Southern Arizona #22210431

$10,000,000—
Mar 6, 2023

Pending

MLS of Southern Arizona #22210431

—
Apr 25, 2022

Listed (Active)

MLS of Southern Arizona #22210431

$10,000,000—
DateEvent & SourcePrice
03/06/2023

Sold

MLS of Southern Arizona #22210431

$10,000,000
03/06/2023

Pending

MLS of Southern Arizona #22210431

—
04/25/2022

Listed (Active)

MLS of Southern Arizona #22210431

$10,000,000

For completeness, we often displays two records for one sale: the MLS record and the public record.

Public Records for 20894 South River Road

Taxable ValueLand$392Additions$65,429Total$65,821
Tax Record2025$2,337 ($195 / month)
Home Facts
Total Finished SqFt2,184 SqFtAbove Grade Finished SqFt2,184 SqFtStories1Lot Size2,054,725 SqFtStyleFarmsYear Built1961CountyPINALAPN307-05-001CFireplace TypeHas Fireplace

Schools near 20894 South River Road

This home is within Mammoth-San Manuel Unified District.
Rating
School
Type
Grades
Distance
First Avenue Elementary School
Public - PK to 6
San Manual Jr. High School
Public - 6 to 8
San Manuel High School
Public - 9 to 12
Rating
School
Distance
First Avenue Elementary School
PublicPK to 6

San Manual Jr. High School
Public6 to 8

San Manuel High School
Public9 to 12

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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Nearby home values

AddressSold priceBedsBathsSqftLot (Sqft)
This home: 20894 South River Road, Mammoth, AZ 85618
$10,000,000
4
–
1,393,920,000
20975 South River Road, Mammoth, AZ 85618
–
–
–
–
1,764,180
20240 South River Road, Mammoth, AZ 85618
–
–
–
750
217,800
20180 South River Road, Mammoth, AZ 85618
–
–
–
1,784
270,943
20100 South River Road, Mammoth, AZ 85618
$75,000
–
–
–
321,360
20105 South River Road, Mammoth, AZ 85618
–
–
–
–
130,680

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Listing Courtesy of OMNI Homes International

The data relating to real estate listings on this website comes in part from the Internet Data Exchange (IDX) program of Multiple Listing Service of Southern Arizona. IDX information is provided exclusively for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Listings provided by brokerages other than Compass and its related brokerages are identified with the MLSSAZ IDX Logo. All Information Is Deemed Reliable But Is Not Guaranteed Accurate. Listing information Copyright 2026 MLS of Southern Arizona. All Rights Reserved.