Bird Valley Quadrangle Traditional Cache

The cache is placed in the USGS Bird Valley Quadrangle in California. This is the thirty-fifth in our series of caches placed near the site for which a USGS 7½-minute quadrangle map is named.

This cache is located between the Middle Fork and the North Fork of Bird Creek in Bird Valley. The Valley is located on the west side of the Dunnigan Hills and can be accessed by heading north from Capay on CR 85, or from Dunnigan by heading west on Road 8 and then south on CR 85.

The Quadrangle boundaries are:
N 38º 45’ 00” and N 38º 52’ 30”
W 122º 00’ 00” and W 122º 07’ 30”.


The United States Geological Survey (USGS) has many missions. At one time, a major mission of the USGS was the supplying of topographic maps of the United States on several scales. Our cache series is based on the 7½-minute quadrangle series.

The term quadrangle is used, instead of quadrilateral or rectangle, because the sides of these blocks are curved. The USGS divided the United States into quadrangles that are 7½ minutes by 7½ minutes. Since a degree is divided into 60 minutes, a quadrangle one degree by one degree contains 64 of these quadrangles.