Black Branch 2

Small headwater stream in an agricultural setting. Low flow conditions, incised channel, and narrow riparian buffer suggest impacts from adjacent land use. Substrate is predominantly limestone cobble/slab but channel shows signs of degradation.

Channel appears generally natural but shows evidence of incision. No artificial structures visible but the channel is somewhat entrenched relative to floodplain. Some downcutting evident from bank heights and exposed rock bed. Adjacent agricultural use has likely contributed to altered hydrology.

Channel appears moderately incised with banks 3-6 feet high relative to channel bottom. The stream is disconnected from its floodplain based on visible bank heights. Agricultural land conversion likely increased runoff volumes and flashiness, contributing to channel incision. Flooding of the floodplain appears infrequent.

Some fine sediment deposition visible between cobbles. The channel bed shows a mix of exposed rock and areas of sediment fill. Not severe but noticeable, likely from agricultural runoff. Approximately 20-30% of bottom affected by fine sediment deposition.

At current low flow conditions, the channel is dominated by very shallow flow over rock substrate with occasional slightly deeper pools. Only slow-shallow and fast-shallow regimes appear present. No deep areas visible. The limited flow volume restricts habitat diversity.

Water fills only a small portion of the channel width, perhaps 25-40% of the active channel. Much of the channel bed is exposed rock. Water appears concentrated in the deepest portion of the channel as a narrow thread of flow. This may reflect low-flow or intermittent conditions.

Some riffle-like features visible where water flows over exposed rock, but these are mostly very shallow. The gradient appears moderate with occasional breaks in slope. Riffle-pool differentiation is poor due to low flow and relatively uniform substrate.

This small headwater stream exhibits characteristics of an entrenched channel (possible Rosgen F or G type) with moderate gradient and cobble/slab substrate. The channel appears to have incised below its original grade, possibly in response to increased runoff from agricultural land conversion. The narrow, entrenched form with moderate sinuosity and cobble bed is somewhat consistent with a G-type or possibly an incised B-type. Low confidence in classification due to limited visibility and small channel size. The limestone bedrock influence is evident in the flat slab substrate.

Left bank (viewing downstream, right side in RIGHT image) shows moderately steep banks with some tree and shrub root protection. Banks are moderately high (3-6ft) but appear relatively stable at this location with vegetative cover. Some bare areas visible but no active mass wasting observed.

Bank vegetation is present but currently dormant. Bare branches of deciduous trees and shrubs cover the bank. Dense vine/shrub understory would provide approximately 60-70% coverage during growing season. Some bare soil patches visible through dormant vegetation. Possible invasive vines (honeysuckle) present in understory.

Left bank is the wooded hillside. Moderate stability with dormant tree and shrub cover. Some natural scour at base. The wooded buffer extends at least 50+ feet on this side.

Right bank (viewing downstream, left side as seen from LEFT image) has a narrower riparian buffer transitioning to agricultural field. Bank stability is moderate but compromised by the narrow buffer and proximity to cultivated land. Some root protection from trees but less than left bank.

Right bank has sparse tree cover immediately adjacent to channel but transitions quickly to open agricultural field. Vegetative protection is estimated at 50-65% coverage. The narrow buffer width limits the effectiveness of vegetative protection. Some invasive vine growth may be present.

Right bank has a much narrower riparian buffer compared to left bank. Agricultural field begins within approximately 25-50 feet of the channel. This narrow buffer is a significant concern for stream health and water quality.

Left bank riparian buffer appears to extend 50-100+ feet based on the wooded hillside visible in the RIGHT face image. The forest extends beyond the visible area. For a channel width of approximately 5-8 feet, this represents well over 2x channel width. However, the structure visible in the FRONT image suggests some development encroachment within the broader buffer zone.

Right bank riparian buffer is narrow, estimated at 25-50 feet before transitioning to open agricultural field. For a channel width of 5-8 feet this is approximately 3-6x channel width, but the overall buffer is thin and agricultural field is clearly visible through the trees. The buffer filtering function is compromised by its narrow width and proximity to bare agricultural soil.

While the left bank has reasonable tree cover, the right bank floodplain has been largely converted to agriculture. The overall floodplain vegetation is significantly altered from natural state, especially on the right side where row crops or fallow field extends to within 25-50 feet of the channel.

Currently all trees are bare so actual shade is minimal. When in full leaf, the canopy from the left bank trees would provide moderate shade (estimated 40-60% of channel). The right bank contributes less shade due to narrower buffer. Overall seasonal shade is moderate but asymmetric.

The right bank riparian buffer is the primary compliance concern. Agricultural cultivation appears to extend within or close to the 30ft minimum buffer zone. Buffer restoration on the right bank through agricultural set-asides or riparian planting would significantly improve stream condition and compliance. The structure visible on the left bank may also represent encroachment but appears to be set back further.

Some cobble and rock substrate provides epifaunal habitat, and a large fallen tree/log is present in the channel. However, much of the substrate is flat limestone slabs that provide limited interstitial spaces. Estimated 25-35% favorable substrate. The low water levels reduce the effective habitat area significantly.

Rock substrate is partially embedded with fine sediment visible between cobbles and slabs. Approximately 25-50% of coarser substrate surrounded by fines. Agricultural runoff likely contributes sediment. Some areas of the bed show clean rock surfaces while others have sediment fill.

Very few pools visible and those present are extremely shallow, likely less than 6 inches deep. The entire bottom is discernible throughout the visible reach. Low flow conditions exacerbate this but the channel morphology does not support deep pool formation.

Limited fish cover available. Large woody debris from fallen tree, some cobble/boulder cover, and overhanging vegetation from bank shrubs provide three cover types. No deep pools, undercut banks are minimal, no macrophyte beds visible, and no backwater areas noted.

No constructed barriers visible within the reach. However, the very low water levels during dry periods may functionally limit fish movement in this intermittent stream. No culverts, dams, or weirs observed.

A large fallen tree trunk is visible spanning or near the channel in the FRONT view. Additional small woody debris is scattered throughout. Estimated 4-6 pieces per 100m visible. The large fallen tree provides potential habitat but is not yet forming significant pool habitat. Mix of fresh fall and moderately decayed pieces.

Three habitat types present: submerged/partially submerged logs from fallen trees, cobble substrate where water flows, and some accumulated leaf packs in slower areas. However, the very low water levels limit the effective wetted habitat. The large fallen tree provides potential colonization substrate but limited by intermittent flow.

Habitat assessment suggests the stream could support a moderate macroinvertebrate community during flowing periods. The mix of cobble, woody debris, and leaf packs provides some diversity. Agricultural influence and intermittent flow likely limit sensitive taxa.

No actual organisms visible in imagery. Score based on habitat assessment only — habitat supports Group II (facultative) organisms given the intermittent flow, moderate substrate quality, and agricultural influence. Actual macroinvertebrate sampling would be needed for definitive assessment.

Suitable Habitat: No

Small intermittent headwater stream with limited habitat diversity. Unlikely to support species of concern given agricultural impacts and intermittent flow. However, limestone substrate could support some endemic macroinvertebrate species during higher flow periods.

No wildlife directly observed. The fallen tree and rock substrate provide potential shelter for small wildlife. Early spring dormant conditions may limit wildlife activity visibility. The agricultural setting likely reduces wildlife diversity compared to fully forested corridors.

Water appears slightly turbid with a brownish color. Given the very shallow depth, the bottom is visible throughout suggesting reasonable clarity. No oil sheen, foam, or scum observed. The brownish tint could be from tannins or fine sediment. Water quality appears fair for visual assessment during low-flow conditions.

No significant algal growth or macrophyte stands visible. Water does not appear green. Some minor organic film may be present on rocks. No evidence of excessive nutrient enrichment despite adjacent agricultural use. The dormant season may mask summer nutrient issues.

No direct evidence of manure, livestock access, or waste discharge visible. The adjacent field appears to be row crop agriculture rather than pasture. No livestock fencing or access points observed. No waste pipes visible.

Stream is likely a warmwater system given the small size, low gradient, and Central Tennessee location. Currently dormant canopy provides no shade — when in full leaf, left bank trees would provide moderate shade but right bank contribution is minimal due to narrow buffer. The open agricultural field on the right bank may contribute to elevated water temperatures during summer through reduced shade and warm runoff. Shade enhancement through right bank buffer planting would benefit thermal regime.

No apparent permit violations observed. The primary concern is the narrow riparian buffer on the right bank where agricultural land encroaches close to the stream, which may not meet TDEC buffer requirements.

Terrestrial Invasives Assessment

Aquatic Invasives Assessment

Low confidence identification due to dormant season with bare branches making species ID difficult. Dense vine growth in understory on both banks is consistent with Japanese honeysuckle, which is extremely common in Middle Tennessee riparian zones. Some shrub growth patterns suggest possible bush honeysuckle. Growing season survey recommended for definitive identification.