What areas does the Black Hills Meridian cover?

The Black Hills Meridian covers the Black Hills uplift and surrounding area, including Custer, Pennington, Lawrence, and Meade counties, along with portions of Fall River and Butte counties. It was established in 1878 to survey the area opened by the Black Hills Gold Rush. Descriptions in these counties use 'Black Hills Meridian' rather than '5th Meridian' or '6th Meridian'

How do I tell which meridian a South Dakota description uses?

The meridian is usually stated in the description. If it is not, county location is the key: eastern counties (Brookings, Minnehaha, Codington, etc.) use the Fifth Principal; central and western range counties use the Sixth Principal; Black Hills counties (Custer, Pennington, Lawrence, Meade) use the Black Hills Meridian.

Why do South Dakota descriptions along the Missouri River have government lots?

The Missouri River historically interrupted the rectangular survey grid, creating government lots along its banks. After Pick-Sloan dams created large reservoirs in the 1950s and 1960s, the original section and government lot structure was preserved in title records even though many parcels are now underwater. Descriptions near Oahe, Big Bend, Francis Case, and Lewis and Clark reservoirs frequently reference these original government lots.

Can I convert South Dakota PLSS descriptions for BLM grazing allotments?

Yes. BLM grazing allotments in South Dakota are defined by PLSS descriptions under the Sixth Principal Meridian. Enter the section, township, and range from the allotment document to map the grazing area. For allotments covering multiple sections, batch conversion processes all parcels at once and exports them as a single mapping layer.

South Dakota PLSS Converter — Section Township Range to GPS

Convert South Dakota Public Land Survey System (PLSS) land descriptions to GPS coordinates using the Fifth Principal / Sixth Principal / Black Hills system.

Convert South Dakota Land Descriptions

Enter a South Dakota PLSS land description to get GPS coordinates instantly.

Example: SE 25 105N 65W 5th Meridian

Open the converter

Understanding South Dakota's PLSS System

South Dakota is surveyed under three principal meridians — one of the more complex multi-meridian arrangements in the Plains states. The Fifth Principal Meridian governs the eastern half of the state, covering the corn and soybean counties of the James River valley and the Missouri River breaks. The Sixth Principal Meridian controls the central and western portions, including the vast rangeland counties of Tripp, Gregory, and Lyman. The Black Hills Meridian — the most geographically restricted of the three — was established specifically to survey the Black Hills uplift and the surrounding area in the southwestern corner of the state.

The Black Hills Meridian stands apart historically. It was established in 1878 in direct response to the Black Hills Gold Rush of 1874, when George Custer's expedition confirmed gold deposits in Paha Sapa — land protected at the time by the Fort Laramie Treaty. The federal government needed a rapid survey framework to process the flood of mining claims, homestead filings, and townsite plats that followed. The Black Hills Meridian's initial point was set on a ridge in present-day Custer County, and its surveys cover the Black Hills counties of Custer, Pennington, Lawrence, and Meade, as well as portions of Fall River and Butte.

South Dakota's ranching economy dominates the western two-thirds of the state, where individual cattle operations often span dozens of sections across both Sixth Principal and Black Hills Meridian territory. The eastern glaciated plains support intensive grain farming with some of the highest per-acre cropland values in the region. The Missouri River and its large reservoir system — Oahe, Big Bend, Francis Case, and Lewis and Clark — created extensive government lot descriptions along the original shorelines that appear in thousands of South Dakota titles today.

Principal Meridians

Fifth Principal Meridian Sixth Principal Meridian Black Hills Meridian

Common Use Cases in South Dakota

Who converts South Dakota PLSS descriptions — and why.

Ranching and Grazing Land Transactions

South Dakota's western rangelands support one of the largest cattle industries in the northern Plains. Ranch sales, grazing lease negotiations, and BLM grazing permit transfers all reference PLSS descriptions across large multi-section tracts. GPS conversion helps buyers, lenders, and grazing administrators confirm the full extent of the land and identify any gaps or overlaps in the legal description.

Black Hills Mining and Mineral Rights

The Black Hills host active gold mining operations, including the Homestake Mine site and several operating open-pit mines. Mining claims, mill site patents, and mineral lease negotiations under the Black Hills Meridian require accurate GPS conversion to verify claim boundaries and surface rights positions.

Eastern South Dakota Cropland

The James River valley and the Coteau des Prairies support intensive corn, soybean, and wheat production. Agricultural land sales, FSA program enrollments, and conservation easements under the Fifth and Sixth Principal Meridians require GPS-verified parcel boundaries for accurate acreage accounting and precision agriculture planning.

Missouri River Reservoir Shoreline

The four large Missouri River reservoirs created by Pick-Sloan dams inundated thousands of PLSS sections and created new government lot descriptions along the new shorelines. Shoreline cabin leases, tribal trust land adjacent to reservoirs, and state recreation area boundaries all use PLSS descriptions that need GPS conversion for permitting and boundary analysis.

Industries: RanchingMiningAgriculture

How to Convert South Dakota Legal Descriptions

Three steps from legal description to GPS coordinates.

Enter your South Dakota legal description

Type or paste your description and include the meridian. A typical eastern South Dakota description reads: SE 25 105N 65W 5th Meridian. A western South Dakota description might read: NW 12 6N 8E 6th Meridian. A Black Hills description looks like: SW 3 2S 4E Black Hills Meridian. The meridian designation is essential given the three-meridian system.

Confirm location on the map

The converter plots the parcel on an interactive map. For South Dakota, verify the parcel is on the correct side of the Missouri River and in the expected county. A wrong meridian selection can shift the result by hundreds of miles, so always cross-check the map before proceeding.

Export for field use or further analysis

Download GPS coordinates as CSV, KML, or GeoJSON. South Dakota ranchers and landmen commonly export to mapping apps for field navigation; title professionals export to county GIS for title plant comparison; mining professionals export to claim management software.

Working with a South Dakota ranch portfolio, a mineral rights inventory covering multiple meridians, or a county parcel database? Batch conversion processes any number of Fifth Principal, Sixth Principal, or Black Hills Meridian descriptions from a single CSV.

Learn about batch conversion

Frequently Asked Questions

Common questions about South Dakota PLSS descriptions and conversion.

South Dakota uses three principal meridians: the Fifth Principal Meridian (eastern counties), the Sixth Principal Meridian (central and western counties), and the Black Hills Meridian (southwestern Black Hills counties). Always include the meridian abbreviation when entering South Dakota descriptions to ensure accurate conversion.