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Blackland Prairies Ecoregion
Wildlife Management Plan for Navarro County, Texas
Navarro County sits at the convergence of 4 Texas ecoregions, with 63 documented wildlife species.
Intelligence Snapshot
Regulatory Complexity
Navarro County has elevated conservation considerations that affect wildlife management planning. The 6 federally listed species documented here mean that brush management, water development, and habitat modification must be designed with ESA compliance in mind. The county spans 4 ecoregions. A plan written for the wrong landscape position could prescribe inappropriate intensity standards or target the wrong species assemblage. A properly calibrated plan accounts for these constraints. A generic plan does not.
Navarro County Ecological Profile
Navarro County's 1,010 square miles contain 13,478 documented oil and gas wells alongside deep, fertile tallgrass prairie soils, creating a landscape where industrial infrastructure and ecological management coexist at close range. The rest has been converted to cropland, improved pasture, or urban development. TPWD's Richland Creek WMA - Carl Frentress Unit serves as a working demonstration of management practices applicable to private lands in the region.
Wildlife management on Blackland Prairie properties focuses on restoring native grassland structure and converting improved bermudagrass pastures back to diverse native warm-season grass and forb communities. This is slow, deliberate work. Successful restoration requires soil preparation, targeted herbicide application to suppress bermudagrass and King Ranch bluestem, and patient seeding of locally sourced native grass mixes. Once established, these grasslands need periodic disturbance through prescribed fire or rotational mowing to prevent woody encroachment by mesquite, Osage orange, and eastern red cedar. Riparian corridors along the region's creeks provide disproportionate habitat value and should be fenced from livestock and managed for native canopy cover.
Transitional Ecoregion
Navarro County intersects 4 distinct ecoregions: Cross Timbers, East Central Texas Plains, South Central Plains, and Texas Blackland Prairies. This is not a minor detail. A plan calibrated to the Cross Timbers would prescribe the wrong intensity standards, the wrong target species, and the wrong management timeline for a property in the Texas Blackland Prairies zone. Property-specific ecoregion classification is the first step in any credible plan.
Soil Conditions
The signature Houston Black clay and Austin chalk series are deep, calcareous vertisols that shrink and crack dramatically during drought, creating unique microhabitat for burrowing invertebrates and reptiles.
Fire Ecology
Tallgrass prairie evolved with frequent fire on a 1 to 3 year cycle. Prescribed burning is essential for controlling woody encroachment and stimulating the deep-rooted perennial grasses that define the ecosystem.
Spans 4 ecoregions: Cross Timbers, East Central Texas Plains, South Central Plains, Texas Blackland Prairies
Despite widespread conversion, the Blackland Prairies still support grassland birds of high conservation concern including northern bobwhite, loggerhead shrike, and dickcissel. Migrating raptors, waterfowl, and neotropical songbirds use the region's remaining grasslands and riparian corridors as critical stopover habitat along the Central Flyway. Texas horned lizard, once common across the Blacklands, has declined sharply due to fire ant invasion and habitat loss. Management that restores native harvester ant populations through fire ant suppression and native grassland restoration directly benefits this iconic species.
Navarro County Species of Conservation Concern
TPWD records 63 species in Navarro County. Birds represent the most documented group at 28 species. The 6 federally listed and 16 state-protected species documented here represent meaningful regulatory considerations for any land management activity.
Primary Management Targets
white-tailed deer, bobwhite quail, eastern meadowlark
Listed Species
Winters along the Texas coast at Aransas NWR and surrounding marshes. Grain field management and wetland water levels in coastal counties affect foraging habitat. Disturbance within 1,000 feet of roosting sites is regulated.
Inhabits dense emergent marsh vegetation. Extremely secretive and declining. Wetland drainage, mowing of marsh vegetation during nesting season, and altered hydrology are primary threats. Marsh management must maintain dense low vegetation.
Nests on bare sand and shell flats along the Gulf Coast. Coastal properties must avoid disturbance to nesting areas during breeding season (March through August). Vehicle traffic on beaches in occupied habitat is restricted.
Migrates through Texas coastal beaches in spring and fall. Depends on horseshoe crab eggs and invertebrates on tidal flats. Beach disturbance during migration windows (April through May, September through November) should be minimized.
Western distinct population segment is threatened. Requires large patches of mature riparian woodland (cottonwood, willow) with dense understory. Clearing riparian corridors wider than 300 feet may trigger consultation in designated critical habitat.
Freshwater mussel found in central and East Texas rivers. Sensitive to sedimentation, flow alteration, and water quality changes. Maintaining riparian vegetation and minimizing erosion are key management practices.
Inhabits dense emergent marsh vegetation. Extremely secretive and declining. Wetland drainage, mowing of marsh vegetation during nesting season, and altered hydrology are primary threats. Marsh management must maintain dense low vegetation.
Nests on bare sand and gravel bars along rivers and reservoirs. Disturbance during nesting season (May through August) must be avoided. Water level management at reservoirs affects nesting success.
Nests on bare sand and shell flats along the Gulf Coast. Coastal properties must avoid disturbance to nesting areas during breeding season (March through August). Vehicle traffic on beaches in occupied habitat is restricted.
Migrates through Texas coastal beaches in spring and fall. Depends on horseshoe crab eggs and invertebrates on tidal flats. Beach disturbance during migration windows (April through May, September through November) should be minimized.
Winters along the Texas coast at Aransas NWR and surrounding marshes. Grain field management and wetland water levels in coastal counties affect foraging habitat. Disturbance within 1,000 feet of roosting sites is regulated.
Freshwater mussel found in central and East Texas rivers. Sensitive to sedimentation, flow alteration, and water quality changes. Maintaining riparian vegetation and minimizing erosion are key management practices.
Depends on harvester ant colonies for food. Fire ant suppression and native grassland restoration directly benefit this species. Listed as state threatened.
Source: Texas Parks & Wildlife Department RTEST Database; U.S. Fish & Wildlife Service Critical Habitat Designations
Blackland Prairies Wildlife Management Standards
Management in Navarro County focuses on converting improved bermudagrass pasture back to native tallgrass prairie. This is slow, deliberate work requiring targeted herbicide, patient native seeding, and prescribed fire on a 2 to 3 year cycle. Because the county spans 4 ecoregions, the applicable intensity standards depend on where the property sits. For the Blackland Prairies portion, TPWD requires 10 to 15 minimum acres, 15% brush management, and annual census documentation (34 TAC Section 9.2002). Primary targets are white-tailed deer, bobwhite quail, and eastern meadowlark. Practice recommendations should reflect each property's specific landscape position within the county.
These are the intensity thresholds your plan must meet for the Blackland Prairies ecoregion. Your county appraisal district will verify compliance against these minimums. A plan that does not address them risks denial of your wildlife management valuation. For a complete overview of the seven management pillars, see the management pillars guide.
This is a hard minimum. The appraisal district will verify that your plan prescribes brush management on at least this proportion of your acreage annually.
Food plots must provide nutritional supplementation for target species. The minimum size and density are set by ecoregion to reflect carrying capacity.
Feeder placement and protein content are auditable. The aflatoxin threshold (20 ppb) is a compliance requirement, not a suggestion.
Fire ant suppression directly supports native harvester ant populations, the primary food source for Texas horned lizard and other ground-foraging species.
Brown-headed cowbirds are brood parasites that reduce nesting success of songbirds. The minimum applies to properties where cowbird trapping is selected as a management activity.
The burn rotation percentage applies over the full plan period. Properties that cannot burn due to WUI constraints must document the limitation and substitute equivalent mechanical treatment.
Nest box density is based on territory size of target cavity-nesting species. Boxes must be monitored and maintained annually.
Source: TPWD 34 TAC Section 9.2002, Comprehensive Wildlife Management Planning Guidelines
Water Resources
4 Groundwater Conservation Districts regulate water resources in the county, with permitting requirements for new wells and production limits that affect agricultural and wildlife management water sources.
Conservation Infrastructure
TPWD manages Richland Creek WMA - Carl Frentress Unit in the county, where land managers can observe demonstrated management practices applicable to their own properties.
Infrastructure
Navarro County has substantial oil and gas infrastructure: 13,478 documented wells across 17 categories and 1,209 pipeline segments recorded by the Railroad Commission. 102 orphan wells are on the Railroad Commission's plugging priority list.
4 ecoregions and 1 endangered species across 1010 square miles. In Navarro County, the plan must be specific to the property's landscape position.
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4 ecoregions. 63 documented species. Navarro County's ecological complexity means the plan has to be specific to your property's landscape position. Calibrated to Blackland Prairies standards.
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