Black Branch 2

Small headwater stream with bedrock substrate flowing through agricultural landscape. Narrow riparian buffers on both sides suggest potential for nutrient and sediment inputs from adjacent agricultural fields. Channel shows signs of incision disconnecting it from the floodplain.

The channel appears natural with no direct structural alterations, but shows evidence of moderate incision into bedrock. The channel is entrenched below the surrounding floodplain level, suggesting past or ongoing downcutting, likely exacerbated by agricultural land use changes in the watershed. The bedrock-controlled channel limits further downcutting but the incision has disconnected the stream from its floodplain.

The channel appears moderately incised with banks 3-6 feet high relative to the water surface. The floodplain is at a notably higher elevation than the active channel, suggesting the stream only accesses its floodplain during significant flood events. Agricultural land use has likely increased runoff peaks and contributed to incision. No dams or withdrawals visible.

The bedrock-dominated channel shows relatively little sediment deposition. A thin veneer of silt/fine sediment covers portions of the bedrock bed, visible in the down-facing image. The bedrock substrate limits deposition in most of the channel. Minor sediment accumulation is present but not significantly altering channel morphology.

The channel is uniformly shallow with low flow. The bedrock substrate creates primarily shallow conditions. No deep pools are visible. Two regimes appear present: slow-shallow in flatter areas and fast-shallow where bedrock creates slight grade changes. The lack of deep water habitat significantly limits diversity.

Water is present and flowing but does not fill the full channel width. The bedrock substrate is exposed along the margins. Water appears to fill approximately 50-75% of the channel width with some bedrock shelves exposed above water level. Low-flow conditions are apparent.

The bedrock channel creates some natural grade changes but the overall gradient is low and flat. The visible reach is dominated by shallow runs over bedrock with limited riffle development. True pool-riffle sequences are poorly developed in this bedrock-controlled section.

This appears to be a bedrock-controlled, entrenched headwater stream (Rosgen F-type) flowing through an agricultural landscape. The bedrock substrate prevents further downcutting but lateral erosion and bank undercutting continue. The channel is disconnected from its floodplain due to incision, likely driven by agricultural land use changes increasing peak flows and reducing baseflow. The natural limestone/shale bedrock controls channel grade and provides the dominant substrate. Channel width is narrow (approximately 6-8 feet) with moderate depth relative to width.

The left bank (looking downstream) is moderately stable due to partial bedrock exposure along the bank toe. However, the bank is moderate height (3-6ft), and in areas where soil overlies bedrock, erosion and bare soil are evident. Root systems from riparian trees provide some stabilization but coverage is incomplete. The very narrow riparian buffer and adjacent agricultural land limit bank stability.

Vegetative protection is limited by the narrow buffer width. Approximately 50-60% of the bank face has vegetation coverage. The canopy is bare (dormant season), and the understory is sparse. Some green ground cover is emerging but overall protection is substandard. The transition to open agricultural field occurs within 10-30 feet of the bank edge.

Left bank has extremely narrow riparian buffer transitioning to open agricultural pasture/hay fields. Sycamore trees provide some canopy but the buffer is inadequate for effective filtering. Possible fence line along the bank edge may indicate livestock management.

The right bank is moderately steep with some root exposure and undercutting visible. A fallen tree indicates some bank instability. However, the denser vegetation and wider wooded buffer on this side provide more root mass for stabilization. Bare soil and erosion are evident at the bank face, particularly where exposed roots and soil are visible.

The right bank has somewhat better vegetative protection than the left, with a denser understory of shrubs and vines (including what appears to be invasive species like bush honeysuckle or multiflora rose). Approximately 60-70% of the bank has vegetation coverage. The wider wooded buffer provides more root zone protection but invasive understory may be displacing native species.

Right bank has a somewhat wider riparian buffer than the left but still transitions to agricultural land. Dense understory of shrubs and vines likely includes invasive species. A large fallen tree indicates some bank instability. Moderate root exposure and undercutting present.

The left riparian buffer is extremely narrow, consisting of a single row of trees (primarily sycamores and possibly eastern red cedar) before transitioning to open agricultural pasture. The buffer width appears to be only 10-25 feet, which is less than 0.33x the estimated channel width and well below TDEC minimum buffer standards. Filtering function is severely compromised.

The right riparian buffer is somewhat wider than the left, with a more developed wooded zone extending perhaps 25-50 feet before transitioning to agricultural land. Multiple rows of trees and a dense shrub/vine understory provide more buffering capacity. However, the buffer still appears narrower than ideal for effective stream protection.

The floodplain on both sides has been converted to agricultural use with only narrow strips of trees remaining along the channel. The vegetation is not in a natural state - the floodplain forest has been largely removed and replaced with pasture/hay fields. This represents a significant alteration from the natural condition.

During dormant season, canopy provides minimal shade (currently under 25%). However, during full leaf-out, the mature sycamores and other deciduous trees would provide approximately 40-60% shade over the channel. The narrow buffer, particularly on the left bank, limits canopy coverage. Scored as 6 considering the seasonal context and projected summer shade conditions.

Left bank riparian buffer is non-compliant with TDEC MS4 permit section 4.2.5.4 minimum 30ft buffer requirement. Agricultural pasture/hay field extends to within approximately 10-25 feet of the channel. Right bank meets minimum standard but not enhanced protection requirements. Buffer restoration along both banks, particularly the left, would significantly improve stream health and is a high priority recommendation.

The bedrock-dominated channel provides limited favorable substrate for macroinvertebrate colonization. While some undercut banks and exposed root systems provide habitat, the flat bedrock offers limited interstitial space. Approximately 20-30% of visible substrate provides favorable colonization habitat. The silt veneer on bedrock further reduces habitat quality.

Using low gradient criteria since this is a low-gradient bedrock stream. The substrate is predominantly bedrock with some silt/fine sediment covering. While bedrock dominates (which would normally score low), some root mats from bank vegetation extend into the water, and there is a mix of substrate where loose rock fragments and sediment overlay the bedrock. Score of 5 reflects this mixed condition.

The channel appears uniformly shallow with the entire bed discernible through the water. No deep pools are visible in any direction. The bedrock substrate and low gradient limit pool formation. Some very shallow depressions may hold slightly deeper water but no significant pools are evident. This is a major habitat limitation.

Fish cover is limited in this reach. Available cover types include overhanging vegetation/branches, some undercut banks, and root mats from riparian trees. Deep pools, large woody debris in the channel, boulders/cobble, and macrophyte beds are absent or negligible. The shallow, uniform bedrock channel provides minimal refuge for fish.

No barriers to fish movement are visible in this reach. However, the very shallow depth during low flow may seasonally limit fish passage for larger species. No culverts, dams, or grade control structures are visible.

Only a few pieces of woody debris are visible in the channel reach. A large fallen tree is visible on the right bank but does not appear to be in the active channel. Some small branches and woody material are scattered in the stream but no significant debris jams or pool-forming LWD are present. The narrow riparian buffer limits LWD recruitment.

Three types of invertebrate habitat are present: undercut banks with root systems, some coarse gravel/rock fragments overlying bedrock, and accumulated leaf packs. The bedrock substrate limits interstitial habitat. No submerged logs, cobble/boulder substrate, or fine woody debris accumulations are evident. Habitat diversity is below optimal but not critically impaired.

Score of 6 assigned based on habitat assessment rather than direct observation. The bedrock substrate with some interstitial spaces, reasonable water quality indicators, and available habitat features suggest the stream could support a Group II (facultative) macroinvertebrate community. The limited habitat diversity and shallow depth may limit species richness.

No macroinvertebrates directly observed from the panoramic imagery. Score based on habitat assessment - the bedrock stream with some cover features and reasonably clear water could support a facultative community. Actual sampling would be needed to confirm.

Suitable Habitat: No

The shallow bedrock stream with narrow riparian buffer provides limited habitat for species of concern. The agricultural landscape and degraded buffer reduce potential for sensitive species. However, the bedrock substrate could support some lithophilic fish species if water depth were adequate.

No wildlife directly observed during this capture. The dormant season and human presence (surveyor wading in stream) likely reduced wildlife visibility. The narrow riparian corridor provides some habitat connectivity along the stream but the adjacent open agricultural fields limit terrestrial habitat.

Water has a slight brownish tint but the bedrock substrate is clearly visible through the shallow water. No oil sheen, foam, or algal mats are visible. The brownish color likely reflects natural tannins and some fine sediment rather than pollution. Clarity appears to be 1-3 feet based on bed visibility. No odor indicators are apparent.

Water is slightly brown but not greenish. Some minor algal growth may be present on bedrock surfaces but no algal mats or heavy growth are visible. No aquatic macrophytes are observed, which may be partly due to the dormant season. Adjacent agricultural land use suggests potential nutrient inputs, but visible indicators are minimal at this time.

No direct evidence of manure or waste in the stream or on banks. While adjacent agricultural fields are visible, there is no evidence of active livestock access to the stream at this location. A possible fence post on the left bank may indicate livestock management/exclusion fencing, which would be positive. No waste pipes or odor indicators are present.

Currently dormant season with minimal canopy shade. During summer, the narrow riparian buffer would provide limited shade, particularly on the left bank where the buffer is only one tree row wide. The open agricultural fields on both sides would contribute to warming. The shallow water depth makes the stream susceptible to temperature fluctuations. Widening the riparian buffer, particularly on the left bank, would be the most effective thermal management strategy. No thermal refugia or cold water indicators observed.

No active permit violations observed. The inadequate riparian buffer is a long-standing condition related to agricultural land use rather than a recent disturbance.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

The dense understory visible on the right bank and portions of the left bank, particularly the green-leafed shrubs emerging early in the dormant season, are consistent with invasive bush honeysuckle (Lonicera maackii), which leafs out earlier than native species. Japanese honeysuckle vines appear to be common in the understory. Some privet and multiflora rose may also be present. The early green growth visible at ground level could be privet or honeysuckle. Confidence is medium due to dormant season limiting identification. A growing season survey would provide higher confidence identification.