This data set contains boundaries for USGS 1:250,000 quadrangle maps in a vector digital format.

Data available online the Arkansas Spatial Data Infrastructure (http://gis.arkansas.gov). 7.5 Minute quadrangle boundaries

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Reference quads for emergency response reconnaissance developed for use by the US Environmental Protection Agency. Grid cells are based on densification of the USGS Quarterquad (1:12,000 scale or 12K) grids for the continental United States, Alaska, Hawaii and Puerto Rico and are roughly equivalent to 1:6000 scale (6K) quadrangles approximately 2 miles long on each side. Note: This data set is available as a national-scale file (>80MB) and as individual regional subsets. Each regional extract includes a 20 mile buffer of tiles around each EPA Region. The URLs for each are as follows: Entire Country: https://edg.epa.gov/data/Public/OLEM/OLEM-OEM/6kquads_epa.zip, Regional subsets: https://edg.epa.gov/data/Public/OLEM/OLEM-OEM/6kquadr[enter region number].zip (e.g., R6 subset URL https://edg.epa.gov/data/Public/OLEM/OLEM-OEM/6kquadr6.zip)

Data available online through the Arkansas Spatial Data Infrastructure (http://gis.arkansas.gov). Quarter Quadrangles of Arkansas

This coverage was derived from the 7.5minute USGS quad coverage for the state of New Mexico. It shows a quad index for the USGS 15 minute quads.