Black Branch 2

Small headwater stream in agricultural landscape. Silt/mud substrate and brown turbid water suggest sediment impairment likely from adjacent agricultural land use. Limestone bedrock outcrops suggest native substrate would be rock-dominated if not for sedimentation.

Channel appears largely natural with no visible structural modifications. Some lateral erosion is occurring but channel form is not heavily altered. Slight incision may be present based on bank heights observed upstream but generally appears to maintain floodplain connection. No evidence of straightening, dredging, or armoring.

Channel shows slight incision with banks 2-4 feet above baseflow in some areas. Floodplain appears accessible during moderate flows based on low bank sections. Agricultural land use in watershed likely contributes to altered hydrology with increased peak flows and reduced baseflow. The channel appears to still connect to floodplain at higher flows.

Fine sediment (silt and mud) covers much of the channel bed, partially burying what appears to be natural bedrock and gravel substrate. Silt deposits are visible in the down face view. While not forming large bars, fine sediment deposition is pervasive, suggesting ongoing sedimentation from agricultural runoff. Estimated 20-35% of bed affected.

At current low flow, the stream is predominantly shallow throughout. Riffles over bedrock provide fast-shallow habitat, while pools between riffles provide slow-shallow conditions. No deep pools or fast-deep areas are evident at this flow level. Only 2 of 4 regimes clearly present.

Water is present and flowing but at low levels. The channel is not fully wetted at baseflow — exposed substrate and bank margins are visible, particularly around bedrock outcrops. Water fills roughly 50-75% of the active channel width based on views from multiple faces.

Bedrock outcrops visible in front and left views create natural riffle features. Based on the visible reach, riffles appear present at moderate frequency where bedrock is exposed but not as frequent as ideal. Some sections appear to be flat-water runs over silt.

This small headwater stream flows through a broad agricultural valley in Middle Tennessee limestone geology. The native bedrock (limestone) is exposed in places, creating natural riffles, but much of the bed is covered by fine sediment. The channel is sinuous with moderate meanders. Classification is difficult due to the small size and fine sediment dominance — could be E-type (low gradient sinuous) or C-type (broad valley meandering). The fine-grained substrate and low gradient favor E-type classification but confidence is low. The stream appears to be in a transitional state with agricultural sedimentation altering the native bedrock/gravel substrate.

Left bank (viewed from right face) shows low to moderate height with trees providing some root stabilization. Some areas of exposed soil and scour are evident. Bank appears moderately stable with tree roots providing partial protection but not extending fully to baseflow elevation in many areas. Green herbaceous cover emerging but not yet fully established.

Approximately 60-75% vegetative coverage. Bare deciduous canopy provides limited current protection though root structure remains. Some herbaceous ground cover emerging. Bare soil patches visible especially at water's edge. Vegetation appears predominantly native deciduous species with cedars.

Left bank shows moderate erosion with exposed roots at waterline. Agricultural field is visible beyond a thin riparian strip. Early spring herbaceous growth is beginning.

Right bank (viewed from back face) shows moderate height banks with steeper slopes. Cedar trees with exposed roots provide some stabilization. Bank height is moderate (3-4 feet in places). Some undercutting visible at tree bases. Banks are more stable where bedrock outcrops exist but less stable in soil sections.

Approximately 55-65% vegetative coverage. Bare deciduous trees provide limited protection currently. Cedar trees provide some year-round cover. Significant bare soil exposed on banks, particularly in steeper sections. Root exposure at bank toe indicates active erosion processes.

Right bank shows more pronounced erosion than left, with steeper slopes, exposed roots, and undercutting. Cedar tree roots provide significant anchoring in places. Agricultural land visible beyond thin riparian buffer.

The riparian buffer on the left bank appears to be approximately 25-50 feet wide before transitioning to agricultural fields visible through the bare canopy. For a channel approximately 8-10 feet wide, this represents roughly 3-5x channel width. However, the quality is thin and the buffer appears limited with agricultural fields clearly visible beyond the tree line.

Right bank riparian buffer appears similar to left — approximately 25-50 feet of woody vegetation before agricultural fields. The back and left face views show open fields clearly visible through the thin tree line. Buffer appears slightly wider in some areas where the wooded corridor extends further.

Some mature trees and shrubs present along both banks forming a riparian corridor, but the buffer is narrow and surrounded by agricultural land. Vegetation is not in a fully natural state — the thin corridor suggests past clearing to the stream edge with some regrowth. Trees and shrubs are present but the overall riparian ecosystem is limited in width and complexity.

Currently bare deciduous canopy provides minimal shade (perhaps 15-25% from trunk and branch structure plus cedar cover). During growing season, canopy coverage would likely reach 50-75% based on tree density and spacing visible in the up face. For a warmwater stream, moderate shade is appropriate but current bare condition and some gaps in canopy suggest moderate shade even at peak leaf-out.

The 30ft minimum buffer appears to be met on both sides but barely. Agricultural fields are clearly visible through the riparian corridor indicating the buffer is narrow. Buffer widening through conservation easements or agricultural buffer programs would significantly improve stream health and sediment filtration capacity.

Limited favorable substrate for epifaunal colonization. Some undercut banks with root exposure and bedrock surfaces provide attachment habitat. Fine sediment covers much of the bed, reducing available colonization surfaces. Estimated 25-35% favorable substrate. Woody debris is sparse in the active channel.

Where gravel and cobble are present, they appear significantly embedded in fine sediment. The dominant substrate visible in the down face is silt/mud overlying bedrock. Bedrock outcrops in front and left views show some fine sediment accumulation in crevices. Root mats are present at bank edges but limited. Overall embeddedness is high due to agricultural sedimentation.

At current low flow, pools are shallow (likely less than 1-1.5 feet deep). The entire bottom appears discernible in most areas. Some shallow pools may be present between bedrock riffles but no deep pools are evident. Pool quality is limited by fine sediment filling.

Four cover types identified: overhanging branches/vegetation (dormant but structural), undercut banks on both sides, root mats at bank toe, and riffle areas over bedrock. Missing are deep pools, large woody debris in channel, boulders/cobble (mostly embedded), macrophyte beds, and backwater pools.

No barriers to fish movement are visible in this reach. The bedrock riffles are low-gradient and would not impede passage. Low flow conditions could seasonally limit passage through very shallow riffle areas but no structural barriers are present.

Very limited large woody debris visible in the active channel. Some small branches and twigs are present as natural debris but no significant logs or debris jams. This small channel would benefit from more LWD for habitat complexity and pool formation. The riparian trees could provide future LWD recruitment but current levels are low.

Three habitat types identified for macroinvertebrates: undercut banks with root structure, some coarse gravel/cobble on bedrock, and natural leaf pack accumulations. Fine sediment coverage reduces habitat quality on cobble. Lack of significant woody debris and limited clean gravel substrate limit invertebrate colonization potential. Bedrock surfaces provide some hard substrate but are partially silted.

Habitat quality suggests a stream that could support facultative taxa (Group II) including crayfish and some tolerant EPT taxa. The fine sediment substrate and turbidity would likely limit intolerant Group I taxa. Score of 6 assigned based on habitat quality assessment rather than direct observation.

No macroinvertebrates directly observable from 360 imagery at this resolution. Score based on habitat assessment — the presence of flowing water over bedrock, some clean substrate, and moderate water quality suggests Group II taxa would likely be present. Fine sediment loading may limit more sensitive taxa.

Suitable Habitat: No

This small headwater stream in an agricultural landscape has limited habitat diversity for species of concern. However, limestone bedrock substrate in a Tennessee stream could potentially support some native mussel species if water quality and habitat conditions improve. No direct evidence of rare species habitat observed.

No wildlife directly observed during survey. Early spring timing and disturbance from wading survey personnel may have displaced any wildlife present. The riparian corridor provides limited but functional habitat connectivity in the agricultural landscape.

Water has a slight brownish tint and is slightly turbid. Based on the down face view, the bed is visible through the shallow water (approximately 6-12 inches deep) but clarity is reduced by suspended sediment. In deeper areas, visibility would likely be 1-2 feet. No oil sheen, foam, or algal issues observed. The brown color is consistent with fine sediment suspension from the silt/mud substrate.

No significant algal blooms, mats, or macrophyte growth observed. Water color is brown from sediment rather than green from algae. Some minor algal growth may be present on substrate but is not conspicuous. The early spring timing and low light penetration from turbidity may limit algal growth. Adjacent agricultural land could contribute nutrients but effects are not visually evident.

No visible evidence of manure, livestock access, or waste in the stream or on banks. Agricultural fields appear to be crop fields (not pasture) based on the dormant vegetation visible. No livestock fencing, trails, or bank trampling observed. However, the adjacent agricultural use warrants monitoring for potential nutrient and pesticide inputs.

This is a warmwater stream in a rural agricultural setting. Current shade is minimal due to dormant season conditions. During growing season, the riparian canopy would provide moderate shade (50-70% estimated). The narrow riparian buffer limits shade potential, particularly at midday. No thermal refugia or heat stress indicators observed. Agricultural runoff during summer storms could contribute to thermal loading but no impervious surface or stormwater discharge is present.

No apparent permit violations observed at this location. Agricultural practices appear to maintain a riparian buffer strip.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Identification is difficult due to dormant season conditions. Some vine and shrub growth patterns in the understory of the right face view are suggestive of bush honeysuckle (retaining green longer into dormancy) and Japanese honeysuckle (vine growth patterns on understory). Confidence is low given bare canopy conditions. Full growing-season survey recommended for accurate invasive species assessment.