Jefferson County - East-West Gateway Coordinating Council

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A Regional Overview All-Hazard Mitigation Plan The Sonsac-Useful-Moko Association ranges from three to 55 percent slope. It covers approximately 58 percent of the county. These soils are most commonly found on narrow ridgetops, backslopes and summits. The parent materials are loess and residuum. Welldrained Sonsac soils (gravelly silt loam-well drained) make up 44 percent of the association. Useful soils (silty loam-moderately well drained) make up 30 percent of the association. Well-drained Moko soils (stony soils) make up 15 percent of the association and the remaining 11 percent are minor soils. The Wrengart-Goss Association ranges from three to 55 percent slope. It covers about 13 percent of the county and consists of soils located on summits, ridgetops, and backslopes. The parent materials are loess and residuum. The moderately well drained Wrengart soils (silty loam) make up 47 percent of the association, well-drained Goss soils (cobbly silty loam) make up 45 percent of the association and eight percent of minor soils make up the balance. The Menfro-Gasconade Association ranges from three to 50 percent slope. It covers about five percent of the county and is located mainly in the summit and backslope areas. Parent materials consist of loess and residuum. The well-drained Menfro soils (silty loam) make up 69 percent of the association. Excessively well-drained Gasconade soils (rubbly soils) make up 17 percent and the remaining 14 percent are minor soils. The Minnith-Pevely Association ranges from three to 50 percent slope. It covers about eight percent of the county. These soils are commonly found on ridgetops and backslopes. The parent materials consist of loess and residuum. The moderately well drained Minnith soils (silty loam) consist of 51 percent of the association. The moderately well drained Pevely soils (silty loam) make up 32 percent of the association and minor soils make up the remaining 17 percent. The Haymond-Freeburg-Horsecreek-Bloomsdale Association ranges from zero to five percent slope. It covers about 15 percent of the county. It is commonly found in the floodplains and terraces. The parent material is alluvium. The well-drained Haymond soils (silty loam) make up 26 percent of the association. The somewhat poorly drained Freeburg soils (silty loam) make up 25 percent of the association. The well-drained Horsecreek soils (silty loam) make up 25 percent of the association and the well-drained Bloomsdale soils (silty loam) makes up about 24 percent of the association. Refer to Figure J4 below. 5
6 FIGURE J4 SURFICIAL MATERIALS MAP Source: Missouri Department of Natural Resources Jefferson County – Section 1 Climate - Surficial materials in Jefferson County consist of residuum from cherty limestone (clay and gravel) up to 50 feet in thickness. These materials are located in the northern half of the county. Surficial materials in the southern half of the county consist of residuum from cherty dolomite (clay, silt and gravel). The materials are normally less than ten feet thick, but can exceed 50 feet in thickness. Surficial materials in the southwest corner of the county consist of residuum from sandstone and cherty dolomite (clay, silt, sand, gravel and boulders) and can be up to 200 feet thick. Form of Government Jefferson County is classified as a first class county and has its county seat in Hillsboro. The county is governed by a three-member County Commission led by the Presiding Commissioner and has 13 municipalities. The county government is divided into the following departments and divisions: Assessors office, Auditor’s office, Circuit Court Clerk, Collector of Revenue, County Clerk, County Commission, Data Processing, Department of Administration, Economic Development, Jefferson County Health Center, Juvenile Office, Land Use Development and Code Enforcement, Parks and Recreation, Public Administrator’s Office, Public Works, Recorder of Deeds, and the Sheriff’s Department. Community Partnerships As part of the EWG region, Jefferson County collaborates on numerous issues including infrastructure, law enforcement and emergency services. MoDOT, Franklin, St. Francois, Washington, Ste. Genevieve and St. Louis Counties collaborate on county lines, as well as transportation issues where it applies to infrastructure systems across the Meramec Rivers. Other community partnerships include the Rock Creek Watershed Management Plan group and the St. Louis-Jefferson County Solid Waste Management District. Jefferson County Planning Division, along with the Missouri Natural Resource Conservation Service (NRCS),
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2 Jefferson County - Section 3 new
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4 Jefferson County - Section 3 Muni
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6 Jefferson County - Section 3 dama
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8 Federal Sources TITLE: PRE-DISAST
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10 Jefferson County - Section 3 gov
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12 TITLE: SOIL AND WATER CONSERVATI
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14 Policies and Programs (ex. Zonin
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2 Jefferson County - Section 4 by f
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4 The mitigation goals include the
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6 Jefferson County - Section 4 TABL
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8 Jefferson County - Section 4 d. E
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10 Jefferson County - Section 4 d.
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12 Monitoring, Evaluating and Updat
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14 Community Action Type of Strateg
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16 1,2,3,4,5,6,7,8,9, Revise flood-
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18 Encourage development of jurisdi
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Jefferson County - East-West Gateway Coordinating Council

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