Black Branch 2

Small headwater stream in agricultural setting with bedrock substrate. Stream appears to support basic aquatic life functions. The thin riparian buffer on the left bank adjacent to agricultural fields is a concern for water quality protection.

Channel appears natural with no visible alteration, straightening, or armoring. Bedrock-controlled channel limits downcutting. Some minor bank erosion but within natural range for a bedrock stream. The channel form appears to reflect natural geomorphic processes.

The channel appears slightly incised into the bedrock but low banks suggest reasonable floodplain connectivity. Adjacent agricultural land use may have altered watershed hydrology somewhat through increased runoff. The channel appears to access floodplain during moderate events given the low bank heights.

Bedrock-dominated channel shows very little sediment deposition. Some fine sediment has accumulated in crevices and low spots of the bedrock, but overall the bed is clean bedrock with minimal deposition. The bedrock substrate inherently resists significant sediment accumulation.

At current low flow conditions, the channel is dominated by shallow regimes. The bedrock substrate creates primarily fast-shallow runs and slow-shallow glides. No deep pools are visible — the bedrock limits pool formation. Only 2 of 4 velocity/depth regimes are evident.

Water is present but at low flow, covering approximately 50-75% of the channel width. Significant portions of the bedrock substrate are exposed, particularly along the edges. Flow appears as a thin sheet over bedrock rather than filling the channel cross-section.

The bedrock-controlled channel creates a relatively uniform gradient with limited pool-riffle differentiation. The stream appears to flow as mostly runs and glides over the bedrock surface, with occasional breaks where loose rock fragments create minor riffle-like features. True riffles are infrequent.

This is a bedrock-controlled headwater stream typical of Middle Tennessee's Ordovician limestone terrain. The thin-bedded limestone creates a characteristic flat-bottomed channel with shallow flow over exposed bedrock. The channel morphology is primarily controlled by the underlying geology rather than alluvial processes. The stream exhibits characteristics of a Rosgen B channel type with moderate entrenchment and bedrock substrate, though the low gradient and bedrock control make classification somewhat uncertain. The sinuosity is low, consistent with bedrock influence on channel planform.

Left bank is low with gradual slope, providing reasonable stability. However, bare soil is evident in patches (26-50%), and vegetative root protection is limited due to the thin riparian strip transitioning quickly to agricultural land. Minor scour erosion is present. Bank is not high but lacks robust root stabilization from deep riparian vegetation.

Approximately 50-70% of the left bank has some vegetative coverage, primarily from dormant herbaceous vegetation, scattered shrubs, and a few trees. The proximity to agricultural fields limits the depth of vegetative protection. Some patches of bare soil and exposed rock are present. Winter dormancy reduces coverage assessment accuracy, but buffer width is clearly narrow.

Left bank transitions quickly from narrow riparian strip to open agricultural fields. Thin buffer is the primary concern. Red barn/farm building visible beyond buffer. Bank is naturally low and relatively stable due to bedrock control.

Right bank is low to moderate height with some root protection from cedar trees and other vegetation. The cedar tree visible shows moderate root exposure indicating some bank erosion processes. However, bedrock at the base helps maintain stability. Bank is not actively failing but shows evidence of ongoing erosion.

Approximately 60-75% vegetative coverage on the right bank with cedar trees providing year-round root stabilization and some deciduous trees and dense shrub layer. Dormant vine and herbaceous vegetation adds seasonal coverage. The buffer appears somewhat wider on this side compared to the left bank. Some bare soil and root exposure present.

Right bank has somewhat better vegetative protection than left bank, with cedar trees providing year-round root stabilization. Some undercutting evident at the base of the cedar tree. Agricultural land and possible structures visible beyond the riparian strip but buffer appears slightly wider on this side.

The left riparian buffer is very narrow, estimated at approximately 10-25 feet before transitioning to open agricultural fields. For a channel approximately 5 feet wide, this represents roughly 2-5x the channel width, but the buffer is thin and dominated by scattered trees rather than dense multi-story vegetation. The overall filtering function appears compromised by the narrow width and proximity of agriculture.

The right riparian buffer appears somewhat wider than the left, estimated at 25-50 feet based on the distance to visible open areas through the bare trees. Contains a mix of cedar trees and deciduous trees with a shrub and vine understory. However, the buffer still transitions relatively quickly to agricultural or open land.

There are some trees, shrubs, and herbaceous vegetation along the banks but the riparian strip is narrow on both sides, particularly the left. The floodplain is largely converted to agriculture. During the growing season, more herbaceous cover would be present, but the tree canopy structure is limited in width.

During winter leaf-off conditions, canopy coverage is approximately 25-40% based on bare branch structure and cedar trees. During the growing season, deciduous leaf-out would increase coverage to perhaps 50-70%. The narrow buffer width limits the extent of overhead shading, particularly on the left bank side where agriculture is close.

The narrow riparian buffer on the left bank is a compliance concern. Agricultural fields extend close to the stream channel. Buffer restoration through replanting and establishment of a wider vegetated corridor would significantly improve filtering function and TDEC compliance. The flat topography and agricultural setting suggest high potential for buffer restoration.

The bedrock-dominated substrate provides limited colonization opportunity. While some crevices in the limestone and the undercut bank areas with root exposure offer potential habitat, the overall substrate is predominantly flat bedrock with few three-dimensional features for macroinvertebrate colonization. Estimated 25-35% of substrate is favorable. Lack of loose cobble, gravel, and woody debris in the channel limits habitat diversity.

Where loose rock fragments exist on the bedrock surface, fine sediment fills approximately 25-50% of the interstices. The bedrock itself doesn't technically embed, but the sediment filling crevices and low spots represents moderate sedimentation. For this bedrock-dominated stream, the score reflects the mix of clean bedrock surfaces with sediment-filled areas.

Pools are essentially absent at this location. The bedrock substrate creates a relatively uniform shallow run with no visible pools of any significant depth. The entire bed is discernible throughout. The flat bedrock prevents natural pool scour. This is the most limiting habitat factor at this site.

Limited fish cover available. Some undercut banks with root mats visible (particularly at the cedar tree), and overhanging vegetation from bank shrubs and trees. However, no deep pools, logs/woody debris in channel, boulders, macrophyte beds, or riffles are present to provide additional cover types. Only 3 cover types identified.

No barriers to fish movement are visible within this reach. However, the very low water depth during current conditions may seasonally limit fish movement through shallow bedrock sections. No culverts, dams, or drop structures observed.

Very little large woody debris is visible in the channel. Some small sticks and branches are present along the banks and in the channel margins but no significant LWD pieces. No debris jams. The narrow channel and thin riparian buffer may limit LWD recruitment. The agricultural land use adjacent to the stream likely reduces large tree availability for future LWD input.

Limited macroinvertebrate habitat diversity. The bedrock-dominated substrate provides limited colonization opportunity. Some undercut banks with root systems and scattered loose rock fragments provide the primary habitat types. No leaf packs, submerged logs, fine woody debris, or cobble/boulder habitat observed in the channel. The smooth bedrock surface has few crevices for invertebrate colonization.

Score based on habitat potential rather than direct observation. Clean water and natural bedrock suggest capability to support facultative organisms, but limited habitat diversity constrains the likely community. Scoring conservatively at Group II level.

No macroinvertebrates were directly observed in the imagery. However, the clean water, bedrock substrate, and moderate habitat suggest potential for Group II fauna. Score reflects habitat assessment rather than direct observation. Winter conditions may reduce visible invertebrate activity. The bedrock substrate could support some pollution-sensitive taxa if habitat diversity were improved.

Suitable Habitat: No

The bedrock-dominated stream with shallow flow and limited habitat complexity is not likely to support rare or sensitive species. However, the limestone substrate and clean water conditions suggest potential for baseline aquatic community. A biological survey during warmer months would provide better assessment of species utilization.

No wildlife directly observed during winter conditions. The dense dormant brush piles along banks provide cover habitat for small mammals and birds. The cedar trees provide year-round cover. The shallow water and limited pool habitat reduce fish habitat value.

Water is very clear at this location. The bedrock substrate is clearly visible through the shallow water with excellent clarity. No turbidity, discoloration, oil sheen, or algal growth observed. The water appears clean and free of contaminants. Some slight brown tint may be from natural tannins but overall clarity is excellent.

Water is clear with no evidence of significant nutrient enrichment. Very minor algal growth may be present on some rock surfaces (slight discoloration observed in the down-facing image) but nothing indicative of nutrient loading. No macrophytes visible. However, proximity to agricultural fields suggests potential for nutrient inputs that may not be evident during low winter flow conditions.

No evidence of manure, waste, or livestock access observed at this specific location. The adjacent agricultural land appears to be crop-based rather than pasture based on the visible open field conditions. No livestock, fencing for livestock exclusion, or manure deposits observed. However, farm buildings are visible nearby.

This is a rural headwater stream with warmwater thermal regime. Current winter conditions show low shade due to deciduous leaf-off, but cedar trees provide some year-round coverage. The narrow riparian buffer, particularly on the left bank, limits shade provision during summer months. The shallow bedrock-dominated channel with no deep pools lacks thermal refugia. Agricultural runoff could introduce warm water during summer storm events, though no impervious surfaces are nearby. Expanding riparian buffer width would improve thermal buffering capacity.

No active permit compliance concerns observed at this location. The narrow riparian buffer on the left bank is a general management concern but does not represent a recent disturbance or active violation.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Winter dormancy severely limits invasive species identification. Some vine growth patterns on the right bank suggest possible Japanese honeysuckle based on vine structure, and some shrub forms suggest possible bush honeysuckle. Confidence is low due to leaf-off conditions. A growing-season survey would be needed for definitive invasive species assessment. The dense vine tangles visible on both banks could contain additional invasive vine species not identifiable in dormant state.